Usually after my tomatoes have finnished, I empty the growbags on the
the compost heap. Last autumn, this did not get done, and the bags are
still hiding in a corner.

Looking for some soil to fill a trough for some spinach beet seeds, I
wondered if I could safely use the old compost either as a base in the
trough or even to completely fill it, possibly adding some Growmore or
something?

Roger T