Hi Marianne, thanks for your reply, yes i do grow them in pots, in a sharp sandy compost mix 40% sand - 60% compost for drainage, but you must give the pot grown plants water every day when it's hot weather (even placing the pots in a bucket to hold extra water through out the hot times, and placed in the ground on a 2" layer of a sandy compost mix them coverd in compost and soil mix 4-6"deep or three times there hight, place and plant in full sun (i find best ) i dont bother to move them as i have a large beech hedge all around my garden, i take the pots only in the winter time, watch out for a red lily beetle, i give them some tomato feed in srping when they come through the soil and that's about it,
hope this helps
enjoy
windy