Hi
I'm new to growing seeds indoors and have had a lot of problems associated with that. The most current is the leaves on one of my tomato plants are turning purple underneath and one of the branches has curled back on itself and the leaves are upside down. This happened overnight. The plants are about 4 weeks old and we're transplanted into 4 inch pots a week ago. They are in sunshine mix number 2 and I fully watered them with half strength fertilizer at the time of potting up. The soil is still damp about 1 inch from the top. The room temp is 66F and they are 2 inches under a t5ho light with a fan blowing. Any ideas of what's causing this please?
Thanks
Paul