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Pathetic lettuce
in Fruit & veg
I've been trying to grow mixed lettuce/salad leaves in my conservatory. The results are a bit pathetic. The photo below is about as good as they ever get (in fact recently they've been more like the container on the left rather than the right) - I have a couple of pots that produced a few leaves and have stayed pretty much the same for about three weeks. And if they do progress, all they do is bolt.

Some have been in Durston's peat-free multipurpose compost, some in my own compost from the compost bin - the only difference is that the pots with homemade compost also produce a few nettle/tomato/assorted weed seedlings as well
The conservatory is east facing but because of the trees at the end of the garden that you can see in the photo doesn't get a vast amount of light. It doesn't get overly hot, though obviously it's been warm of late, particularly as we've been closing it off to keep the house cooler. But they were pathetic before the really hot spell too.

I've not been feeding them, beyond a splash of Baby Bio when I've been doing the houseplants, but I'd have thought the compost would have at least enough nutrients to get them past this stage.
Any suggestions as to cause and remedy, please? I try to grow my own really just to reduce plastic use but it's quite possible there's more plastic from the bags the compost comes in than the amount I'd save by not buying bags of mixed leaves.
BTW, I've tried growing them outside in the past but between the slugs and the leaf miners they've been even less successful.
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In the sticks near Peterborough
I've had a brilliant crop of lettuce this year but the seedlings were planted out in the veg patch back in early June ... the veg patch was treated with slug nematodes la couple of years ago and we've had very few serious marauders since then.
The veg patch has lots of home made compost applied each year, Blood, Fish and Bone applied before planting and chicken manure pellets for the leafy veg such as lettuce as it's high in nitrogen which is what they need.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I keep them in shady locations though - they don't perform well in full sun
I live in west central Scotland - not where that photo is...