About Yucca filamentosa L.
Yucca filamentosa L. is typically trunkless, and produces multiple suckers that form clusters of strappy, filamentous blue-green leaves up to 75 centimeters (30 inches) long. This species can be easily distinguished from other yuccas by the presence of white, thread-like filaments along its leaf margins. In early summer, flower stems growing up to 3 meters (10 feet) tall produce large clusters of drooping cream-colored flowers. Yucca filamentosa is native only to the region stretching from Maryland south to Florida and west to Louisiana; inland, it is native to Tennessee and West Virginia, but has been introduced to Kentucky. It is also an introduced species in New York and Massachusetts, and has been reported growing in France, Germany, Italy, Albania, Hungary, Romania, and Turkey. In its native habitat, this species is most often found in sunny open areas with sandy soil, especially in beach scrub and sand dunes, but it also grows in fields, barrens, and rocky slopes. It grows successfully in silt or clay soils as well. In open, sunny, dry areas, Yucca filamentosa spreads horizontally to form a dense thicket of sword-shaped foliage. It is hardy to USDA plant hardiness zones 5 through 12. This species is pollinated by the yucca moth Tegeticula yuccasella. Other moth species, including Tegeticula intermedia, also use Y. filamentosa as a host plant to lay their eggs. Yucca filamentosa is widely cultivated in mild temperate and subtropical climates. Although it is a fairly compact species, it has a striking appearance thanks to its sword-like leaves and prominent flower heads. It naturally acts as a focal point in landscaping, and can add a tropical feel to temperate gardens. It requires full sun and well-drained soil, and prefers a pH between 5.5 and 7.5, which is acidic to slightly alkaline. It develops a large, fleshy white taproot alongside deep lateral roots. Once planted and established, it is difficult to remove, because its roots continue to produce new shoots for many years. It is typically hardy down to −29 °C (−20 °F), corresponding to USDA hardiness zones 5 to 9 (UK H7). After seeds are removed, the fruits of Yucca filamentosa can be cooked and eaten. The large flower petals can also be eaten raw in salads. Compounds from the leaves, stems, and roots of the plant can be used to stun fish, a use that was historically practiced by the Cherokee people.
