I now have tomato plants, looking healthy and strong, surviving an overnight low of 40 degrees Fahrenheit (4 degrees Celsius) and ready for potting up or planting in the greenhouse bed. As my greenhouse is unheated, the transition from there to outdoors will be easier and will probably just take a weekend. Over the last two weeks they have gone from a couple of hours in the weak morning sunshine to whole days out and now finally overnight when a frost doesn’t look likely. Personally, I move my plants into my greenhouse for increasing amounts of time. Cold frames and greenhouses have the advantage that they can be opened up more and more over a few days, providing a further element of control. To ease this transition, an intermediate stage can be introduced – either a greenhouse, cold frame or row cover.
Direct strong sunlight which can scorch young tender leaves.Greater variation in water supply due to the above factors which increase evaporation from plants outside.Chill factor, moisture loss and buffeting of moving air.This time is required for them to adjust due to the: This generally involves taking them outside for just a couple of hours each day at first and then gradually lengthening that time until they are ready to spend a whole day and eventually nights out. Seedlings need to be gradually introduced to the outdoors in stages over a period of at least a week and preferably two. How best to harden plants off is the subject of much debate amongst experienced gardeners, so I thought I would round up the best advice available: Without this vital step it is all too easy to lose precious plants or have them wilt from the sudden change in conditions between a warm windowsill and a draughty garden. ‘Hardening off’ is the vital process of getting seedlings ready for the big outdoors.
#Harden tomato seedlings how to
As the grand day approaches, the last thing you want is a late frost killing them off, so learning how to ‘let them go’ is crucial. But soon it’s the letting them go that’s important, particularly when prize seedlings that have been nurtured for two months are about to face the outdoor world. At first giving them all the attention they need to have the best possible start is the vital thing. I think raising seedlings is very similar. It has been said that being a good parent involves first learning to have your child around you 24/7 and then learning to let them go.
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