I always grow quite a lot of aubergines, tomatoes, peppers and melons in 2 unheated ricketty old greenhouses on my allotments. I'm just gearing up to sow the seeds in the south-facing conservatory at home. For years I grew them in grobags on shelves - a back problem prevents me growing them at ground level. For the last 2 or 3 years I've changed to growing them in various large containers filled with shop-bought cheapest multi-purpose compost. It all worked very well last year....
Now I'm wondering about re-using last year's compost, pepped-up with liquid feed. As I'm reluctant, perhaps unable, to pay lots of money for all-new compost. I'd be grateful for advice as to whether this is a practical notion....? What problems and failings might there be? eg pests? inadequate nutrition? anything else?
Or - am I just too much of a cheapskate for this game...?