Red cabbages

No.

Get them out of that propagator.

At 3cms high, they will already be leggy. To try and save them get them into a light place and stick some aluminium foil behind them to reflect light.

1 - You are way to early with them.
2 - Brassicas are very hardy plants and do not need propagators.

 I don't know what variety you've got, but reading the instructions on the back of my packet of Red Drumhead,(always a good guide), it says to sow March to May outside, so January in a heated propagator is definitely not recommended.

My simple solution would be to throw them away & sow under the correct conditions at the correct time.

I will actually start mine inside, but only in April in an unheated greehouse. They won't get planted out until June/July.

Now's the time for a tidy up of your seed box whilst sitting in front of a roaring fire eating toast.

Now THAT'S what I call multi-tasking!! (how many arms have you got, Noshed?) 

Since they have been sown I would grow them on to about six inches high and then put the whole lot in a stir fry.

Cheers,

Gillie

its fuego Fi it says to start ina propergator in jan then  plant out in march april time

Fuego F1 - looked them up, the write up does say indoors, Jan onwards, (doesn't mention propagators), although I'm not disputing the pack may.

I find it amazing that a seed supplier has told people to start  brassicas off in a propagator.

Don't be tempted to go for the earliest sowing dates on the pack. You run into problems with having your plants too early & conditions not being right to put them out.