I use a friend's garden in Longridge, Everything is grown in pots in a commercial compost.
I am moving soon and have a couple of large hellebores, in huge pots, at £1 each (for the pot, really!) one is greenish and flowers very generously; the other is white and only just getting going this year. Also lots of different mint plants, free, and a wormwood also in a big pot, £1, which could be planted out. Phone number to follow shortly. Plants are in Longridge, Lancashire.