Glossary
PPFD
Growers call it a measurement of how much usable light actually reaches the plant, used for indoor growing. Minimum useful level for mature cacti is about 750; 1000–1250 is much better, growers say.
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Learned from the sanpedrocact.us community wiki (CC BY-NC 4.0) and from @sanpedromastery6262 on YouTube.
Every photograph in the yard pages and the shop is of a plant grown here, except where a listing says it was grown by somebody else — it says so on the listing, above the price.
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