you can find vermiculite at any garden supply store or even feed/seed style stores. I expect a place like Walmart may have it too but probably only little bags. I bought a huge bag (like three feet tall size bag) for about $14 CDN couple years ago. I expect it will last me for a long time..but their small bags were $5 I think and one small bag may have lasted me two or three clutches...

Vermiculite is basically a soil lightener...mixed with regular potting soil to better retain moisture and take out some of the weight plain soil would add for potted plants.
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PHLdyPayne

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