GH floor material options?
Getting towards final stages of 500 sqft (~21 x23') GH, mainly for mounted botanical miniatures. Will have some concrete platform around edges for benches. In center, the most common option is 3/4" crushed rock, some 4-6" deep. Someone suggested bark as moisture reservoir. Am a bit concerned about bark serving as a pest reservoir, and don't really want to spray the floor with all the -cided.
Any opinions, experiences?
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