Posted: 04/06/2016 at 20:23
Hi GD, they're pretty hardy. I live in the South East on heavy clay. The plants are large enough by September to withstand any slug attacks.
They grow on a bit and then sit through the winter, as Spring develops they race ahead. I guess you could grow them under protection but they're pretty bombproof out in the garden so I don't bother. The only thing I do is pinch out the growing tips to create bushy plants.