I want to increase my stock of Asiatic lilies by growing on the offsets. I have about 200 growing together at the moment in 3 large stock pots in rich soil (3x67!). The bulbs are still quite small, about the size of a chick pea.

My question is: what sort of timescale should I be thinking about for moving them on? I'm thinking about potting them on individually into 4 or 5 inch pots eventually until they are ready to go into the border, so I can keep them in rich compost. Our garden soil is too poor otherwise and I don't have a nursery area. How long before I do this? We have a very mild climate so they will be in growth throughout the winter. Now is summer!