Lots of lettuce seedlings...

I have loads too many and just wondering if they'll grow to full size if they’re in 1 litre pots on kitchen windowsill? It's the cut and come again variety.

 

They will if you prick them out and feed them as they grow.

 

What's the best thing to feed them with? I'd plant 1 per 1 litre pot too.

 

Well if its a non hearting type you could use three to a pot perhaps and I'd just use something like miracle gro, or similar.

 

Many years ago I used to grow webbs wonders, one to a 5 in pot, always got a good sized lettuce with a bit of feeding, they even hearted up well.

 

If you mean you have lots of seedlings in a pot and are using it as a cut and come again [successfully] then you can leave some to carry on doing that, and prick out others to pot individually. I grow a variety of types, and the salad bowl kinds are ideal either way.
If you want to feed, I'd use a seaweed product as that's most suited to foliage growth, rather than for flowering, so it's ideal for things like lettuce. For anything pricked out individually, the new compost mix will be enough sustenance for a while though

 

In my experience lettuce seed needs to be fresh, once opened use the packet in the same season.

 

I seem to remember lettuce seed not staying viable for long.
I also believe it won't germinate above a certain temperature, can't remember what that temperature is but it could be the reason for poor germination in mid summer.
In a normal year.

 

I reported a lettuce to a 1L pot, see how growth I get from them, they still get plenty of warmth and sunlight.

 

Be alert for aphids, grey mould (botrytis}
Lettuce do not need extra warmth nor strong sunlight, an average British summer is fine !;
in fact are a useful crop for partially shaded areas. Moderate watering only.

 

I've always found that lettuce prefer cooler weather conditions, the ones that have escaped the slugs have done well this year .

 

Definitely @Scroggin. Even here, I don't really have lettuce in full sun sites, or if I do, they don't stay there for long. It does best in a bit of shade, and without that full on heat.
The 'moats' are ideal for pots of it too. Helps to keep those slugs off them

 

Unless there is a effective slug remedy made available, possibly as simple as ferric phosphate in a bait which is more paletable than pasta flour, so that molluscs prefer it to crops, then all raised beds will be needing moats or electrified barriers. Copper is said to be a deterent, perhaps two strands with a voltage potential would be expedient ?

 

I don't have anywhere else to put the lettuce for now, what I ordered off Amazon, a veg trug, only appeared with just the cover so back it went. I'm poised with more cloches but find 1 per big pot a bit O.T.T