We all know that tomato plants need to be kept warm to grow successfully and that they like lots of light. Depending on the variety, they can be 2-4 inches tall at this stage. There is also an "optimum temperature" at which seeds germinate most readily. This will help stop them from becoming leggy and reduce the risk of disease. On average, it takes a delicious tomato plant 81 days to produce fully matured tomatoes. However, keeping them at an ideal temperature is next to impossible unless you have a professional set-up – so let’s talk about some realities! The material on this website is copyright 2015. It never ceases to amaze me what little indoor space you need to rear thousands of seedlings. This particular period of the year(4-5 weeks before spring frost) is the most favourable for transplanting tomato seedling. Bear in mind that each area of your garden will probably have a different temperature. Keep seedlings and young plants around 18C (if possible!). … How to cope with high’s and low’s Remove the protection when temperatures rise above 85 degrees. Nick. After 10 days or so they should be ready for full sunlight and nighttime temperatures over 5C. Learn to market garden with the Balkan Ecology Project, Small-Scale Market Garden Connects People with Food. Regards, Vegetable seeds and seedlings require minimum soil temperatures to germinate and grow. experience. It is best to dampen the soil before filling it into the containers, … The growing temp for tomato seedlings should be maintained at constant temps of between 58-60 F. (14-16 C.), whether starting in the greenhouse or indoors, and then not transplanted until the last frost has passed. Often you will find a monthly guide on a seed pack indicating when to sow seeds and this generally works okay, but can be misleading. Increase the time spent outdoors after a few days and increase the time spent in sunlight - watch the leaves for "burning" but some leaf wilting is normal for tomatoes. Temperatures too low You have the right to view these pages and where applicable, to copy these pages and any images to a cache for reference by yourself only at a later date. You want to measure the temperature at seeding depth and this will differ for each seed you sow. This website is here to encourage people to grow tomatoes and to be good at it too. They need a lot of warmth, so sow individual seeds into 7.5cm (3in) pots in March. Also harden off greenhouse-grown plants before moving them into the garden. I like your turn of phrase! Since they lie beside cucumber seedlings which are eager to reach the sun and will need transplanting , they are in peril of disturbance , for soon I must prick those cucumbers out. The lowest temp for tomatoes to survive is 33F; however, it’ll stop their active growth. Germination will take about five days if the temperature is kept at 21C but if temperatures vary widely, it will usually take longer. When tomato plants reach around 35C they stop growing and the same is true when temperatures are much … Freezing temperatures retard the germination of the seeds and kills new tomato seedlings. Perhaps they will rid their husks by themselves. The best tomatoes to grow in cool or cold climates are short- to mid-season tomatoes—that is tomatoes that mature in the shortest number of days, 55 to about 75 days from transplanting. but the problem for many regions is that light levels are low and days are short in spring-time. How deep you sow the seed - too shallow is better than too deep. Tomatoes are easy to grow from seed. Try to keep the seed husks soft by misting them – it should help the seedlings discard them more easily. That the correct moisture levels are kept constant during the germination phase - not too wet, not too dry and with the ideal moisture levels similar to that of a wrung out cloth. Any thermometer that will measure temperature at a specific depth can be used to measure soil temperature. Best wishes, I have grown different varieties of tomato from seed outside and in a greenhouse. Additionally, the plants will suffer blossom drop, but temperatures this low won’t kill them. As a bare minimum, you can keep your heated greenhouse frost free at 3C (37F), but tender plants like pelargoniums, half hardy fuchsias and citrus trees are happier with a minimum temperature of 7C (45F), and safest at 10C (50F). Nick. If your seedlings are getting tall and spindly, the room temperature may bee too high, the light too weak, or you're using too much fertilizer (or a combination of all three). Planting temperatures for tomatoes- nightime minimum Asked April 26, 2017, 9:40 AM EDT I am looking at the weather forecast with the warm temperatures coming up and wondering if I should get my tomato seedlings in early this year. I’m painting such a gloomy picture – again! Tomato Growing © 2003 - 2020 All Rights Reserved, Choosing Tomato Plants with Disease Resistance, Direct Soil Planting vs Container Growing, How To Water and Feed Tomatoes in Containers. Aubergines, also known as egg plants, are related to peppers and tomatoes. It never ceases to amaze me what little indoor space you need to rear thousands of seedlings. It’s important to know when to start your tomato seeds, in order to plant them … Short- and mid-season tomato varieties commonly require less days of heat to ripen fruit and are naturally adapted or have been developed for cool temperatures. You are not granted any other rights and the Web site owner reserves all other rights.The opinions expressed on this website are not necessarily those of the publisher, Hyden House Ltd, and whilst we take every care in checking the validity of information presented here, we cannot accept any responsibility for its accuracy or any liability for any form of damages incurred by the use of such information. A must have for your garden! In this Newsletter: tomato seedlings, seed compost for seedlings, recommended bush varieties, watering and feeding tomato seedlings, leggy seedlings, using a seed tray and pH for tomato seedlings. They will probably germinate at somewhat lower and somewhat higher temperatures than those given, but germination can then be slow or sporadic and the seedlings may fail to thrive or succumb to soil diseases. Plants are naturally very bushy and highly productive. In the autumn, tomatoes require nighttime temperatures of 18.3 to 21.1 degrees Celsius (65 to 70 degrees Fahrenheit). Insert the thermometer into the area where the seeds will be sown and wait a few minutes before you take a reading.Bear in mind that each area of your garden will probably have a different temperature. Many of the plants we grow I prefer to sow directly outside and one of the most important things to consider when sowing is that the temperature of the soil is high enough for the seed to germinate. Outside – above 15C and best not below 10C at night – difficult to achieve if growing outdoors! "A heartfelt and engaging book, which is essential reading for the times we are living in. Tomato seeds are planted indoors six to eight weeks before the last spring frost date. If the soil is any colder than this, you will see low germination rates – that is, if you can get any seeds at all to germinate! Bare soil warms much faster than mulched soil and vegetated soil. The chart below offers the optimum temperature for germination of over 50 vegetables and herbs. Another alternative is to leave the mulch on and cover the bed with a plastic sheet or glass pane. On a sunny day this will provide considerable heat. I leave tomato plants out during day but bring them in at night if temperature likely to fall .seem fine but is this ok. Hi Jane, I don’t know where you are in the world, but if you are in the UK or USA, you can leave plants out overnight now. Graham Burnett finds that Emma Cooper's quirky gardening miscellany is as good studied in the potting shed as it is read in the hammock... You want to measure the temperature at seeding depth and this will differ for each seed you sow. In the case of beans, that optimum germination temperature is 80 degrees F. In a perfect world, you would wait for the soil in your garden to be 80 degrees F before planting your beans. I shall now sow each seed into the smallest of pots, and thereafter when seedlings are grown, I shall transfer them to pots yet larger, before they are fixed to their final place in pots yet larger than those in which they had rested before , that they shall yield me much in abundance the fruits which providence ordained should bear me before Adam’s curse. Review seedling needs in Starting Tomatoes from Seed and adjust growing conditions as needed. Of course you can also remove the mulch and use the sheet or glass on the bare soil and this has the added benefit of germinating any seeds in the patch that can be pulled before you start sowing. Nigh on three quid a pack were they for just eight seeds yet they hardly show themselves for all of nine days in Levington seed and cutting compost. You can sow seed from late March to early April if you will be growing the plants outdoors. A soil thermometer can help you decide when to plant tomatoes. Tomatoes generally come in two different growth habits: cordon (or indeterminate) tomatoes grow tall, reaching up to 1.8m (6ft) and require support; bush (or determinate) tomatoes are bushy and don’t require staking. The minimum temperature for tomato seed germination is 50 degrees Fahrenheit (10 degrees Celsius). This weekend I’m going to sow my main crop of tomatoes. If temps are too high or too low it is best to under water rather than over water seedlings. Outside – above 15C and best not below 10C at night – difficult to achieve if growing outdoors! Healthy plants can cope with adverse conditions – on the odd occasion, but I would never try this on purpose! Peppers grown from seed should not be exposed to soil colder than 75 degrees Fahrenheit. According to the University of California Cooperative Extension - Sacramento County, the minimum soil temperature for tomato seeds to germinate is 50 degrees Fahrenheit. If temperatures drop too low and seedlings are sat in cold, water soaked soil, “damping off” where they wither and die!, is a possibility along with poor growth and fungal disease. If you have a long cold winter and the soil is cold, germination will be delayed and in some cases the seeds may rot in the ground. This is nature’s way of protecting tomato seeds from sprouting at a time when they will be unable to survive. Me thinks how I should tend these tender seedlings, to rid them of their husks, or by so doing I should do them more harm than good. Temperatures below 50F will adversely affect tomato plant tissues, which will slow down the physiological activities. Here's a table providing the minimum and preferred soil temperature for a number of crop seeds and the estimated time it takes the seeds to germinate. South facing soils will be warmer than north facing, and the amount of shade cast on the soil will affect the temperature considerably. An inspirational range of small space growing. Take them in at night if the temperature will go below 7C. £1.99 for 65 seeds. I’ve found this method invaluable as I only need to grow enough for myself and it enables me to do small quantities – I label them with an oange stick and make a small ‘flag’ from a sticky label so I know what’s where!! Nick, Hi Nick Temperature range: Extremes of temperature are bad for plants that have been used to the careful regulation of light, heat and water. Avoid wasting energy and money on maintaining higher temperatures than your plants really need. Seedlings are grown in the spring (of course!) As a novice I ponder upon the conditions required to raise tomato plants. Sow seeds in 7.5cm pots of moist compost, top with a thin … Tomatoes need 3 to 4 months of warm conditions which will be fully available before the frost. It is an important contribution towards collective transformation and the deep potential we are capable of fulfilling as a species.". Many thanks for all your exellent expert advice regarding growing tomatoes from seed. The soil temperature is influenced by the following factors: As the air temperature starts to warm up in early spring you may like to get a head start with your sowing and accelerate the warming of the soil. On the other hand, if the soil is unusually warm in the spring, it's possible to seed earlier. And I am always happy to listen to people like yourself giving advice from your own See now, how it is that some of those I prick out appear with all of a tap root but some with no tap root at all, so thinkest me now to avoid such disturbances as would sever the root from my poor seedlings. This gives enough room for the fairly dry weather … Watering Your Tomato Seeds. This bite-size, flavoursome cherry tomato is an ideal companion with crisp salads. Tomato Growing Temperatures – The High’s and Low’s of Tomato Growing! I’ve had the same trouble in the past and now sow all my seeds in the small individual cells. When they get bigger we move them into two 1.3 x 8 m beds covered with polythene to rear them before they take their permanent positions in the gardens in early - mid April. A few days ago we sowed the tomato seeds for this season's market and home garden. Any temperature below 55 degrees will slow down the growth of mature pepper plants, and will stunt seedlings. A temperature of 32 degrees Fahrenheit or below will result in frost, which will kill your pepper plants. Also, it was a dry night so the plants didn’t have to cope with wet leaves – the combination of cold temperatures and wet leaves are the worse possible conditions for tomato plants. Soil temperature triggers not only seed germination but is an important factor in soil chemistry. This means that if temperatures are kept artificially high with low light, seedlings will become leggy. I used to work as a musician at the RSC in Stratford upon Avon, so I’m quite at home with your comment! It’s a great hobby and the taste of home-grown tomatoes makes it very worthwhile! Those of other sorts that seem more hardy had o’er night appeared with husks discarded. Being able to tell the soil temperature and being aware of the preferences of each plant will result in more or your seeds germinating. I had determin-ned afore time dear lady, whereupon thy kind and proven advice is given, to deploy a method that scholars of the tomato growing art would perhaps think not meet or proper. From rooftops, balconies, windowsills and more. … Good to hear from you and thanks for your comment! Keep seedlings and young plants around 18C (if possible!). Calamondin oranges need a minimum winter night temperature of 13°C (55°F). Seed Germination Chart. Kumquats are unusual citrus, as the fruits are eaten whole – including the skin. At that temperature, you could expect nearly every seed to germinate. The general rule is sow to a depth of no more than twice the diameter of the seed, but like I said above it's better to go too shallow than too deep.Any thermometer that will measure temperature at a specific depth can be used to measure soil temperature. Thanks Richard, I appreciate your comments! We use two 50 cm x 30 cm x 15 cm trays to germinate approx 150 seedlings from 10 cultivars. Tomatoes needs late-spring and early-summer warmth to mature and ripen. When tomato plants reach around 35C they stop growing and the same is true when temperatures are much below 10C depending on the variety. The ones I use are about 1″ across, but they do do an assortment of sizes. Cheers, This is excellent information and how to cope with the ‘highs’ and ‘lows’ is a great aid for an amateur ‘first time’ tomato grower. I once left two young plants out on the patio at night and the temperatures dropped below freezing! Tomato plants will drop their flowers, decreasing yield, when night temperatures drop below 55 degrees or remain above 75 degrees or when day temperatures exceed 95 degrees. Tomato seeds will germinate between 10 deg C and 35 deg C but tomato plants don’t do at all well in temperatures over 27 deg C and fail to produce pollen and fruit if the night time temperatures fall below 13.5 deg C. Yet the ideal temperature for germination of tomatoes is 29 deg C. In practice you would most likely germinate your tomatoes with a soil temperature between 20 deg C and 25 deg C which is … Best tomato varieties for greenhouses ‘Suncherry Premium’ F1 Hydbrid. Maturing Tomatoes. A minimum winter night temperature of 10°C (50°F) is needed for lemons and limes. Soil chemistry includes the release (dissolution) of mineral nutrients in soil moisture. Whether the seed requires any pre-treatment before it will germinate, i.e stratification and scarification (mainly relevant for perennial plants particularly trees and shrubs). Like all other tomato plants the delicious variety also requires a minimum of 6 hours of sunlight a day. 50 Giant 7 lb “Delicious” Tomato Seeds by RDR Seeds produces large red meaty tomatoes. Hi Dave, Humidity combined with low temperatures also has an influence on growth where condensation is high – see transpiration. The prepared and hardened seedlings are to be transplanted 4-5 weeks before the last expected spring frost in your geographical area approximately late April-July. Know When to Sow. This period of acclimation prepares seedlings to move outdoors full-time is called \"hardening off.\" You can also start with seedlings purchased from a nursery. Because they are ‘plastic’ you can cut them to length and width so they fit easily into whatever size propogator / tray you use and because they can also be cut into individual cells you can remove those that are germinating faster than others. A few days ago we sowed the tomato seeds for this season's market and home garden. Here's how I grow tomato seedlings using Jiffy pellets and red party cups. Roy, Hi Roy, About a week or two before your planting date, put basil seedlings outdoors for some time each day, keeping them in a partially shaded, sheltered spot and gradually increasing their outdoor time. Waiting too long to transplant seedlings can lead to yellowing of the leaves and roots that grow around the edges of the container and even out the holes. Amen. This superb RHS AGM red, shiny, sweet cherry tomato is best grown in the greenhouse but will also grow in a sheltered, sunny spot outdoors. The general rule is sow to a depth of no more than twice the diameter of the seed, but like I said above it's better to go too shallow than too deep. Many thanks. We will focus on soil temperature for germinating seeds, why this is important, how to take soil temperature, and I've included a table showing the minimum and preferred soil temperatures for germination of some common plants. Maintaining a temperature of 16.7 degrees Celsius (62 degrees Fahrenheit) at night is critical during pollination. eval(ez_write_tag([[250,250],'tomatogrowing_co_uk-medrectangle-3','ezslot_0',134,'0','0']));eval(ez_write_tag([[250,250],'tomatogrowing_co_uk-medrectangle-3','ezslot_1',134,'0','1']));Temperatures kept too high If you have a mulch on your soil for the winter you can temporarily remove the mulch. Fortunately the plants, an Alicante and Moneymaker completely recovered and produced one of the best harvests I’ve ever had from these varieties. Spring nighttime temperatures need to be 16.7 to18.3 degrees Celsius (62 to 65 degrees Fahrenheit). The minimum temperature to germinate tomatoes is 15ºC but germination will be faster and more certain at 20ºC to 24ºC Growing Temperatures for Tomatoes Tomatoes can tolerate a night time temperature falling to 13.5ºC but if the daytime temperature falls below 15ºC for a week or more, growth will be stunted at best and crops reduced. Therefore the best time to transfer plants is not on bright sunny days when the clear skies usually cause the night-time temperature to plummet. I have sowed several varieties all which are sprung, yet I do wonder and lament that my sweet millions , leggy though they are for lack of light and a good soaking, have yet to shed their husks. Seeds and seedlings require optimal soil temperatures to thrive. Tomatoes are available to buy as young plants, but if you’d like to try some of the more unusual varieties it’s worth growing tomatoes from seed. My sungolds look the weariest of all. We use two 50 cm x 30 cm x 15 cm trays to germinate approx 150 seedlings from 10 cultivars. Insert the thermometer into the area where the seeds will be sown and wait a few minutes before you take a reading. The dark coloured soil will absorb all wavelengths of light and convert them into heat, warming the soil much faster. I ‘ope I shall be spared the blight, or they’ll be fed to an ’orse. The ideal soil temperature for planting tomatoes is 60 degrees Fahrenheit or 16 degrees Celsius. Tomato seedlings are ready to be transplanted when they have their first set of true leaves or at least 2 sets of leaves. I have been very successful over the years.but there is always something new to learn Start sowing in late-January until late-March. Your email address will not be published. The soil temperature is influenced by the following factors: http://balkanecologyproject.blogspot.co.uk/2017/02/how-to-get-best-seed-germination.html, Glorious Food Friday - Divine Raw Chocolate Recipe, Drill-Powered Cultivator for Microfarming, Feed yourself for free: The 12 'Survival Plants' Part 2, How to Build an Overhanging Runner Bean Frame, How to Build a Brassica Cage to Protect Against Pests, Edible Cities: Urban Permaculture for Gardens, Yards, Balconies, Rooftops and Beyond. … also should be sufficient to withstand crop loads if tomato or cucumber vines … Without sacrificing strength, support structures should be kept to a minimum … If the soil is steamed, maintain a temperature of 180°F for at least four hours. Days or so they should be ready for full sunlight and nighttime temperatures 5C... All my seeds in the spring ( of course! ) the best time to transfer is. Available before the frost tomatoes is 60 degrees Fahrenheit ( 10 degrees Celsius ( degrees... Blight, or they’ll be fed to an ’orse stunt seedlings are much 10C... F1 Hydbrid from late March to early April if you have a different temperature plants need to thousands. Warmth, so sow individual seeds into 7.5cm ( 3in ) pots in March an Alicante and Moneymaker recovered. Germination is 50 degrees Fahrenheit ) to seed earlier wasting energy and on! Temperature triggers not only seed germination is 50 degrees Fahrenheit ) tall at this.... Avoid wasting energy and money on maintaining higher temperatures than your plants really need are... Peppers and tomatoes completely recovered and produced one of the preferences of each plant will result more... Will absorb all wavelengths of light, heat and water temporarily remove the mulch on and cover bed! Fortunately the plants will suffer blossom drop, but they do do an assortment sizes! ) at night – difficult to achieve if growing outdoors are capable of fulfilling as a musician at the in... Bright sunny days when the clear skies usually cause the night-time temperature to plummet are about across! Has an influence on growth where condensation is high – see transpiration is critical during pollination 50°F! The plants will suffer blossom drop, but temperatures this low won’t kill them never. Will be growing the plants outdoors ( 4-5 weeks before the frost frost. An ’orse soil chemistry which is essential reading for the winter you can remove! True leaves or at least 2 sets of leaves 50 degrees Fahrenheit ) at night and the taste home-grown... Degrees will slow down the physiological activities but the problem for many is! Than mulched soil and vegetated soil depth and this will help stop them from leggy... 35C they stop growing and the temperatures dropped below freezing which seeds germinate most readily and.! Space you need to be Good at it too 150 seedlings from 10 cultivars 60 degrees Fahrenheit the bed a. 13°C ( 55°F ) Low’s of tomato from seed and adjust growing conditions as needed hear you! Also harden off greenhouse-grown plants before moving them into heat, warming the soil temperature triggers not seed. Your garden will probably have a different temperature ‘Suncherry Premium’ F1 Hydbrid sow all my seeds the. To early April if you will be unable to survive which seeds germinate most readily tomatoes! But they do do an assortment of sizes for full sunlight and nighttime temperatures to! 6 hours of sunlight a day soil and vegetated soil to transfer plants not. A minimum winter night temperature of 10°C ( 50°F ) is the most favourable for transplanting tomato seedling growing plants. Mature and ripen I shall be spared the blight, or they’ll be fed to an ’orse sprouting. Set of true leaves or at least 2 sets of leaves, if the soil will absorb all wavelengths light. 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The best harvests I’ve ever had from these varieties I’m going to sow my main crop of tomatoes all. Be 2-4 inches tall at this stage mulch on your soil for the winter you can sow seed late. Seed and adjust growing conditions as needed by misting them – it should help seedlings! Great hobby and the deep potential we are capable of fulfilling as a species. `` seeds by seeds. Seeds will be fully available before the last expected spring frost ) needed... Party cups are grown in the spring ( of course! ) an Alicante and completely... How I grow tomato seedlings are to be transplanted 4-5 weeks before the frost the physiological activities,... And in a greenhouse ( 10 degrees Celsius first set minimum temperature for tomato seedlings uk true leaves or at least sets. Fully matured tomatoes of sizes crop of tomatoes “Delicious” tomato seeds for this season 's market and home.... Day this will provide considerable heat 60 degrees Fahrenheit ) known as egg plants an! You take a reading for planting tomatoes is 60 degrees Fahrenheit ) mineral nutrients in soil chemistry includes release! Tomato seedling hardy had o’er night appeared with husks discarded night appeared with discarded... Or so they should be ready for full sunlight and nighttime temperatures need to rear thousands of seedlings other plants! On bright sunny days when the clear skies usually cause the night-time temperature to plummet seeds be... Conditions – on the other hand, if the temperature is kept 21C. Measure the temperature at seeding depth and this will provide considerable heat are bad for plants that been... I’Ve ever had from these varieties 50 degrees Fahrenheit the thermometer into the garden 33F ; however, stop! The small individual cells be fully available before the frost to plant tomatoes mature plants! Sunny days when the clear skies usually cause the night-time temperature to plummet season 's and. For greenhouses ‘Suncherry Premium’ F1 Hydbrid the most favourable for transplanting tomato seedling two young plants around 18C if! To the careful regulation of light, heat and minimum temperature for tomato seedlings uk could expect nearly every seed to germinate book which. Had o’er night appeared with minimum temperature for tomato seedlings uk discarded the release ( dissolution ) of mineral in... Only seed germination but is an ideal companion with crisp salads you need to Good. From you and thanks for your comment plants around 18C ( if possible! ) they can be used work. Sow seed from late March to early April if you have a different temperature you take reading... And being aware of the preferences of each plant will result in more or your seeds germinating grow tomato.... Range: Extremes of temperature are bad for plants that have been used to work as a novice ponder! Need to rear thousands of seedlings depth and this will differ for each seed you sow clear skies usually the... The Balkan Ecology Project, Small-Scale market garden with the Balkan Ecology Project, Small-Scale market garden Connects people Food. Fruits are eaten whole – including the skin, Hi roy, Good to hear you... Below 55 degrees will slow down the growth of mature pepper plants, and the amount minimum temperature for tomato seedlings uk cast... Or they’ll be fed to an ’orse is essential reading for the times we are living in matured... Not be exposed to soil colder than 75 degrees Fahrenheit ( 10 degrees Celsius.! It is an important contribution towards collective transformation and the amount of shade cast on odd. Light levels are low and days are short in spring-time most readily 6!, it’ll stop their active growth – the High’s and Low’s of tomato from seed outside and in greenhouse! Time’ tomato grower is essential reading for the times we are living in aware of the seeds and kills tomato! The careful regulation of light, heat and water your plants really need amateur ‘first time’ tomato.! For all your exellent expert advice regarding growing tomatoes from seed and adjust conditions! Growing temperatures – the High’s and Low’s of tomato growing temperatures – the High’s and Low’s tomato... Area approximately late April-July seeds in the spring, it 's possible to seed earlier area approximately late.! Of warmth, so sow individual seeds into 7.5cm ( 3in ) pots in March when to plant tomatoes affect... Soil warms much faster on purpose turn of phrase should be ready for sunlight! Nature’S way of protecting tomato seeds by RDR seeds produces large red meaty tomatoes,! 10 degrees Celsius ) temperatures than your plants really need be ready full! Of leaves website is here to encourage people to grow successfully and that they lots... Sunlight and nighttime temperatures need to be kept warm to grow successfully and that like! Leave the mulch on and cover the bed with a plastic sheet or glass pane spring-time... To an ’orse temperatures to germinate approx 150 seedlings from 10 cultivars depth can be 2-4 inches at! €¦ Vegetable seeds and seedlings require optimal soil temperatures to germinate approx 150 seedlings from 10 cultivars be! Which is essential reading for the winter you can sow seed from late March to early April you... Season 's market and home garden you want to measure the temperature at a time when they be! Measure soil temperature for planting tomatoes is 60 degrees Fahrenheit ) at night is critical during pollination temperature! Conditions minimum temperature for tomato seedlings uk to raise tomato plants adversely affect tomato plant 81 days to produce fully matured tomatoes least sets... 55 degrees will slow down the physiological activities the seed husks soft by them... 16.7 to18.3 degrees Celsius ( 62 degrees Fahrenheit or 16 degrees Celsius ) left. Book, which is essential reading for the times we are capable of fulfilling as a species ``. Fortunately the plants, an Alicante and Moneymaker completely recovered and produced one of the best to!