By Nuttynigel
United Kingdom 
My top leaves are curling up and looking like fearn leaves they are growing in Levingtons deep fill grow bags one type is gardeners delight and the other type is sweet baby 3 of each in each bag all looking the same ,3 tigerellar in another levingtons deep fill bag but purchased from a different place ,could the problem lie in the growbags
7 Jun, 2020
Answers
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-leaves-curling.htm
I have to admit that I've not seen this before and had to look it up (see above). The options are: leave them alone and see what happens or destroy them all and start again with new plants (there is still time), with new compost in pots or direct if you have soil in your greenhouse. If you are still undecided then why not grow some new plants outside in the garden?
7 Jun, 2020
Thanks I think I will wait and see after all the tomatoes are forming ok it is just the growing tops
7 Jun, 2020
thinking about this more a few yrs ago there was an issue with distorted toms and pots due to residual weedkiller or was it pesticides in compost. if the grow bags are 'old' that could be the cause.
7 Jun, 2020
Welcome to GoY.
I suspect its the change in temperature as we have gone from very hot to rather cool.
see how they do in the next week or so.
7 Jun, 2020