toppling over is def a problem if there is a heavy wind (ive had it happen multiple times)... but if its breezy it seems to hold its own... maybe that problem can be solved with something heavy on the base?
i actually found these at target for $10! they hold about 5-7 plants depending on the roots and are easy to roll in and out... they are pretty sturdy and dont seem to have a problem holding the weight.. i also use this for my cattleyas and it works just fine.
hope this helps!
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