Five threatened milkvetch species bloomed together this June across the ridges…

June 30, 2026Northwestern Glaciated Plains

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Five threatened species bloomed together this June across the ridges and grasslands from Pincher Creek up into Castle Wildland Park — more than 30 records since early May. Their co-occurrence is significant: these nitrogen-fixing plants are faithful indicators of intact native soil structure. Once the cryptobiotic crust breaks, milkvetches vanish, and the recovery window closes fast.

The discovery of (Cynoglossum officinale) on June 23rd adds a quiet cautionary note. This Eurasian invader thrives where native plant communities weaken, and its presence here — even in isolation — signals that the ecological margin supporting these rare Astragalus species is narrower than the current bloom might suggest. Vigilance and active restoration will be needed to hold what remains.

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