I have hederafolium & coum in the garden ( Spring & Autumn flowering) A seedling at the one leaf stage will have a small bulb & transplant easily, larger bulbs store well also. The move will be fine as they are tough & a covering of compost is just what the seed needs anyway. I always find you will never get a 'tidy' plant when digging them up as they flop & the leaf stems can break easily but they always recover. They are fascinating in as much that seed pods curl back down to the ground when ripening & it's a race to collect the very sweet sugar coated seeds before the ants get them. Nature sure is clever eh?