What to put in bottom of pots?
I have just bought a couple of quite big terracotta pots, and plan to put some summer flowering bulbs in them, and perhaps something like nemesia round the edge. It would take a huge amount of compost to fill them, and I don't think the plants need such deep compost. Any ideas about what to fill the bottom half of the pots with? I wish now I'd kept some polystyrene packing!