Blackroot (Pterocaulon pycnostachyum) is a unique, deciduous perennial in the aster family. Native to Florida, it’s the only species of its genus found in the state, with a rare counterpart in Louisiana and Texas. Blackroot thrives in various habitats, from flatwoods to sandhills, and tolerates a range of conditions, from moist soil and shade to dry, sunny areas. 
Reaching a height of 1-2 feet by early summer, Blackroot emerges in spring with a rosette of basal leaves and distinctive wand-like flowering stems. Its deep green, lance-shaped leaves have silvery undersides and winged stems, creating a striped appearance. Flowering occurs from late spring to fall, producing knobby, spiked inflorescences that bloom over several weeks. The small, dull white flowers attract pollinators like bees and butterflies.
The plant’s tuberous black roots store water and nutrients, helping it survive dry periods. However, Blackroot contains coumarin, a compound used in perfumes and blood thinners, which is also toxic if ingested. Despite this, Blackroot is a valuable addition to wildflower gardens and natural landscapes, serving as a host plant for caterpillars and providing nectar for butterflies.
Commonly known as dense-spike blackroot or coastal blackroot, this striking plant adds beauty and ecological benefits to any garden.