See pics below. I have a long rectangular flower pot which sits on the ground, surrounded by a slate-topped retaining wall on the left and a slate walkway on the right. There are a few inches of mulch immediately around the pot. The pot contains new potting mix. It isn't draining properly out of the bottom holes, though. Right now there's just mud underneath, which clogs the holes. What's an easy solution to promote better drainage under the pot? I was thinking a layer of sand (which I have on hand), or perhaps very small pebbles of some type, but I wanted to check here first before using the wrong thing. How thick a layer should I use, and of what? Thanks.
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