We’ve got a large pot in our yard, approximately 20” in diameter and about the same deep. What’s planted in it requires very little soil. Is it problematic to fill much of the void with styrofoam to save weight and soil? From what I’ve read, and for all intents and purposes it doesn’t decompose. Will it break down in some way to plug up the pot’s drain holes.
What kind of plant is this? I personally wouldn’t recommend using Styrofoam.
If you can get cornstarch pellets, or something similar, something that is biodegradable, that would work better.
Can’t you use perlite?