I've just bought some rootrainers on ebay, 3 sets of deep cells (new cells, used trays) for £16.64 inc postage.
I'm dying to use them, so what could I plant in them now?
Beans for a follow on crop?
you could then plant some sweet peas in them for next year, they go great guns on rootrainers.
The deep rootrainer cells are really good for fruit cuttings.