Tag Archives | plant stewardship index

What’s Your PSI?

Asclepias purpurascens (CC 6), A. syriacus (CC 1), and A. tuberosa (CC 6)

Asclepias purpurascens (CC 6), A. syriacus (CC 1), and A. tuberosa (CC 6)

I consider myself a plant geek, and somewhat of a computer geek, but a math geek I’m definitely not. Numbers are not my friends. Generally, that’s not a problem in the mostly non-numeric world of gardening. Apart from having to remember a few simple measurements and conversion factors, I figured I’d be free of complicated math after college. So I was appalled when I first heard about the Plant Stewardship Index (PSI): a system for quantifying the “naturalness” of a piece of land. The idea of assigning numeric values to plants, adding them up, and running them through esoteric formulas seemed at first glance like a bunch of bureaucratic nonsense. Within the first few minutes of hearing it explained in a lecture at the Millersville Native Plants in the Landscape conference a few years ago, though, I was totally hooked by the idea. Continue Reading →

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