08/11/2023
Thanks to Dave, who saw my Manfreda post, and Laura with the DCR, who teamed up to bring me out for a tour of the Lee County, VA Eryngium yuccifolium (aka Rattlesnake Master) patch!
A member of the carrot family, Eryngium yuccifolium is an awesome pollinator magnet. The species is disjunct in Virginia: found in over a dozen counties in the southern piedmont, but also this one patch in Lee County which about as far west as you can get in the state. It's been used by indigenous people for millennia as a fiber plant, so if they were brought here they may be closely related to E. yuccifolium elsewhere, but nobody's done genetic testing on them yet.
The DCR is managing this patch using those big terrifying roadside mulching machines to reduce canopy cover, letting the mulch sit for two or three years, and then doing controlled burns on the site. A few plants were found in the 1990s, disappeared as the canopy closed in, and reappeared with more active management. Laura says the population grows to 150% of its previous size with each subsequent burn.
We spent some time looking at E. yuccifolium with floppy or snapped stems - one cool piece of ecology with these plants is that they're the exclusive hosts for Papiapena eryngii, the Eryngium Stem Borer Moth. The moth hasn't been documented in Virginia yet, and is critically imperiled in Kentucky.
We don't have any Eryngium yuccifolium for sale this year, though we grow the selection 'Kershaw Blue' (for its glaucous blue leaves) and hope to have some available next year. We do currently have a good number of the rare, moisture-loving, blue-flowered Eryngium aquaticum v. ravenelii from the Carolinas for sale.