"Commercial compost only has enough nutrients for about 3 months, so it won't really support a second crop unless you do lots of extra feeding which defeats the object somewhat. Like Caroline, I usually compost it or add to the border as a soil…"
"I add mine to the compost heap, as long as it's relatively weed and insect free (check for vine weevil grubs etc). Alternatively it goes on to a border as a soil improver, I suppose it could go on to a raised bed in the same way, as long as you…"
"Common potting compost is usually made from sterile peat or a peat alternative, mixed with a chemical fertilizer. The three main problems with reusing it for more plants are the organic material can break down making it too compact, the nutrients…"