Posted: 17/03/2015 at 12:16
Tubers are quite big, seed trays tend to be shallow. I grow them in largish flower pots from mid March in the greenhouse to plant out in the garden when the frosts are over. Otherwise, plant them directly in the ground in early May so the frosts are over by the time the leaves come up. But they will flower later. Can you fit a flower pot on a windowsill? The tuber needs to be about 6 inches deep in the pots, depending on their size, so that there is about an inch of soil over them. They can later be planted a bit deeper. Don't forget to feed and water them. They don't need a lid.