Firetail Mountain Fleece, Knotweed, Mountain Fleece, Red Bistorta, Red Mountain Fleeceflower
Bistorta amplexicaulis, commonly known as Mountain Fleece, is a robust, herbaceous perennial that forms large clumps and spreads out, thriving in sunny, moist environments. One notable variety is Firetail, which is popular in European gardens for its striking red flowers that bloom profusely throughout the summer on tall spikes, making it an excellent choice for cutting gardens and floral arrangements. This plant belongs to the Buckwheat family, with its name derived from the Latin term “Bistort,” meaning "twice twisted," which refers to its distinctive S-shaped root, and “Amplexicaulis,” which translates to "clasping the stem," highlighting how its leaves encircle the stem.
Mountain Fleece thrives in consistently moist, well-drained soil and prefers full sun to partial shade, although it appreciates some shade during the hotter summer months. It can tolerate wet conditions and grows at a moderate pace, typically reaching heights and widths of 3 to 4 feet within 2 to 5 years. Under ideal conditions, this species can gradually spread, making it suitable as ground cover, though it may self-seed. While it is not invasive, it is best planted in areas where it has space to expand. Propagation can be done in spring or fall by dividing the rhizomes. Although self-seeding can occur, the resulting seedlings often do not resemble the parent plant. To maintain a tidy appearance, it is advisable to cut back the flowers after they have bloomed. Applying a layer of mulch, such as bark, pine needles, or chopped leaves, can help retain soil moisture and protect the plant during harsh winter conditions.
Regarding pests and diseases, Mountain Fleece is generally resilient and does not face significant issues. However, it may attract aphids, Japanese beetles, slugs, and snails. Additionally, it is wise to shield the plant from strong winds.
