Dense-spike Blackroot
Pterocaulon pycnostachyum
Last reviewed: June 2026
Light
full sun
Water
medium
Size
12"–36" H × 6"–18" W
Bloom
Jul, Aug, Sep
Native to
AL, FL, GA, MS and 2 more states
Pollinators
bees, beetles
Dense-spike blackroot is a medium-sized perennial wildflower that produces distinctive white, cylindrical flower spikes from summer through early fall. This native plant forms compact clumps with fuzzy leaves and thrives in sunny locations with moderate water needs.
In an HOA neighborhood
Dense-spike Blackroot takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Appearance too wild and weedy for most HOA standards
- Unknown winter appearance creates uncertainty
- Not commonly recognized as an ornamental plant
Wildlife value
The summer blooms attract various bees and beetles, providing nectar during the peak growing season. This native plant supports local pollinator populations with its reliable flowering period.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Does Dense-spike Blackroot fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.