Perhaps they will rid their husks by themselves. When tomato plants reach around 35C they stop growing and the same is true when temperatures are much â¦ 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. 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. 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. Fortunately the plants, an Alicante and Moneymaker completely recovered and produced one of the best harvests Iâve ever had from these varieties. 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. Insert the thermometer into the area where the seeds will be sown and wait a few minutes before you take a reading. There is also an "optimum temperature" at which seeds germinate most readily. How to cope with highâs and lowâs At that temperature, you could expect nearly every seed to germinate. You can sow seed from late March to early April if you will be growing the plants outdoors. Roy, Hi Roy, If you have a mulch on your soil for the winter you can temporarily remove the mulch. 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. Itâs a great hobby and the taste of home-grown tomatoes makes it very worthwhile! but the problem for many regions is that light levels are low and days are short in spring-time. Your email address will not be published. Spring nighttime temperatures need to be 16.7 to18.3 degrees Celsius (62 to 65 degrees Fahrenheit). My sungolds look the weariest of all. 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. This particular period of the year(4-5 weeks before spring frost) is the most favourable for transplanting tomato seedling. Bare soil warms much faster than mulched soil and vegetated soil. An inspirational range of small space growing. Soil temperature triggers not only seed germination but is an important factor in soil chemistry. In the autumn, tomatoes require nighttime temperatures of 18.3 to 21.1 degrees Celsius (65 to 70 degrees Fahrenheit). It is an important contribution towards collective transformation and the deep potential we are capable of fulfilling as a species.". Amen. Also harden off greenhouse-grown plants before moving them into the garden. 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. Being able to tell the soil temperature and being aware of the preferences of each plant will result in more or your seeds germinating. 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. If the soil is any colder than this, you will see low germination rates â that is, if you can get any seeds at all to germinate! The minimum temperature for tomato seed germination is 50 degrees Fahrenheit (10 degrees Celsius). This weekend Iâm going to sow my main crop of tomatoes. 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