Should I give up hope of growing Coriander?

[UnGoogleable]

I bought one of those growing pots of Coriander from Lidl (at 95p, I thought it worth a gamble).

I repotted it into multi-purpose compost. It wilted almost immediately, but there are a few new shoots coming through. There is a tiny green caterpillar eating some of the leaves, which I've tried to pick off as I find them.

I've also planted coriander seeds and ended up with 3 pathetic seedlings which are also failing.

The pots are in my utility room, which has a clear plastic roof and windows so it's more like a greenhouse - very bright, very warm. I keep them well watered, but I wonder if I'm over watering them?

What am I doing wrong??

[TalkinPeace]

Lettuce I always do from the supermarket pots
ditto basil and parsley
coriander hates root disturbance and I'm losing the will to live with it !