Could anyone tell me why it's necessary to have at least 2ft space between sprout plants? And could I plant cabbage between the sprouts, thus making a brassica bed.
Firstly I would say that it is not necessary to plant them two feet apart I plant mine 15" apart.
This is not to say that planting them further apart is wrong, in fact it is the most common method e.g. 2-3 ft apart.
Its just that I have experimented over the years and this spacing suits my growing methods, location and soil type. Other people might have other reasons for their spacings.
But what I wouldn't do choose how far apart they are is;
interplant with anything.Even weeds have a hard time coping under sprout leaves such is the darkness they create.