Posted: 06/04/2016 at 20:46
Depends how big they are, if it were me, I would put them in pots first, if you plant them straight in the garden, you will never see them again. As those little shoots grow, so the slugs will chew them off, then they won't grow at all.
Pot them up with the white shoots just level with the compost and watch for slugs.
Whe they have grow into big plants, you can put them in the garden about 2' apart. They do spread once established.
If they haven't made a good sized plant by the end of summer, I would keep them in the greenhouse until next Spring.
They don't always over winter in their first year.