In message , Lawrence
Tierney writes

I think I'll definitely go for the plastic shelter idea (in
combination with some sort of irresistable slug snack treat). So, one
final question. Assuming the slugs do congregate under the black
plastic, what is the best time of day to remove them? Morning, after
their midnight feast?

Yes, though they probably won't move around very much during the day.

Max
--
Max Wright
www.wys-systems.demon.co.uk/plotcrop