Brassica plants

I bought one of those ‘root trainer’ module units.
Started off cabbage & cauliflower in these ... the result is plants with quite long thin stems ... about 4-5” and bent over in a curve.
My question is, these OK to still use ? .... if so should I plant deep enough that only 2” or so of stem is above ground ?

 

Would be better (I think) to start Brassica seeds off in a seed tray (or a shallow pot) and then prick them out to root trainers. When you prick them out you can "bury" them up to their seed leaves - but even so their stems will probably still elongate, but at least you will have minimised it.

You can plant them deep (up to first leaves) when you plant them out. They will probably flop over and grow a stem all-curled-up in the meantime, but it should not matter - although it can contribute to them becoming "blown".

If they have poor light levels (e.g. growing on a windowsill) or if they are warm (Brassicas are best off outside, rather than given heat of windowsill or greenhouse etc.) that will be inclined to make them more "leggy"

But I do all the right things (I think!) and I still have an unwanted extra inch or two of stem ... perhaps I should prick them out later, and then I could bury more of the stem. I tend to prick out as soon as the seed leaves are "holdable" but before 1st True Leaves have grown.