[wyandotty]

My tomato plants in the greenhouse are growing well but looking a bit pale.  Can anyone tell me if you can feed them when they are this young?  They are about three inches tall or do they just need repotting into a bigger pot?

[DD.]

You don't feed them until the fruit sets, otherwise you will make a lot of leaf. They should be in 3" pots at this stage, what size are yours?

Do you have heating?

[Babstreefern]

I agree with DD, don't feed them until they have flowers.  Mine were in the conservatory, and their height was about 6 inches high.  I've now put them in the greenhouse, in their final pots (ex-flower pots from Morrisons - 99p for .  If you use these, don't forget to cut holes in the bottom for drainage.