@Leftwood I'm facing the same issue here this winter....after an horrendous extended summer drought now we are having rain almost every day. So for the time being all my previous year lilies are being repotted into a new grow bags and kept under a waist high polytunnel; however I will eventually run out of space. So I'm planning to sit my grow bags inside a trench outdoors. As an alternative to placing pots underneath the lilies, could a layer of very coarse sand mixed with pebbles, beneath do the trick? My soil is naturally almost pure sand so I haven't seen a bath tub overflowing situation...( nor would I want one for sure). In spite of copious rains, puddles still are draining fast, no standing pools.
Arturo
