Large plastic totes as planters?
Looking for planters for my neighbors exposed, super-sunny front porch I stumbled upon big plastic totes in the storage section of the hardware store. The 18-gallon ones are maybe 24" long, 15" across, and 20" deep -- and are a mere $6. I'm trying to find ways to lessen the need to water frequently, and these seem like a good (cheap!) option.
Has anyone used these kinds of containers on their balconies? Any suggestions/warnings/advice? The ones I saw are dark blue; should I scout around for a lighter color, or is soaking up the heat much of an issue?
So far we're thinking a 1-gallon hibiscus and some smaller plants like thyme, moss roses -- ground-cover-like. Any guidance on how many plants we can comfortably crowd in? (I think she's planning on treating these plants like annuals.)