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Description
Illecebrum Verticillatum, commonly known as Whorled Knotweed, is a perennial herb that belongs to the family Polygonaceae. This plant is native to Europe and North Asia but is also found in North America as an introduced species. It is a low-growing plant that typically grows up to 30 cm in height. The leaves are alternate and have a narrow, lanceolate shape. The flowers are small and pinkish-white, and they bloom from May to September.
Taxonomic Information
| Domain | Eukaryota |
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Magnoliopsida |
| Order | Caryophyllales |
| Family | Polygonaceae |
| Genus | Illecebrum |
Appearance
Whorled Knotweed is a low-growing plant that forms a dense mat of foliage. The leaves are 1-3 cm long and 1-2 mm wide, with a pointed tip and smooth edges. The stem is slender and branched, with small pinkish-white flowers arranged in whorls along the stem. The flowers have five petals and are about 3 mm in diameter. The seeds are small and black, and they are contained within a capsule.
Care Guide
Whorled Knotweed is a low-maintenance plant that is easy to care for. It prefers well-draining soil and full sun to partial shade. Water regularly but do not overwater, as this plant can tolerate drought. Fertilize once a year in the spring with a balanced fertilizer. This plant is hardy in USDA zones 4-8.
Common Pests & Diseases
Whorled Knotweed is not prone to many pests and diseases. However, it can be susceptible to root rot if the soil is too wet. Aphids and spider mites may also infest this plant, but they can be controlled with insecticidal soap or neem oil.
Habitat
Whorled Knotweed is native to Europe and North Asia but has been introduced to North America. It can be found in a variety of habitats, including meadows, fields, and along roadsides. This plant prefers dry, sandy soils and full sun.
Question and Answer
Q: Is Whorled Knotweed an invasive species?
A: While Whorled Knotweed is not a listed invasive species, it can spread quickly and form dense mats of foliage, which may crowd out native species.
Q: Can Whorled Knotweed be grown in a container?
A: Yes, Whorled Knotweed can be grown in a container as long as it has well-draining soil and regular watering.
Q: How often does Whorled Knotweed need to be fertilized?
A: Whorled Knotweed only needs to be fertilized once a year in the spring with a balanced fertilizer.
Q: How tall does Whorled Knotweed grow?
A: Whorled Knotweed typically grows up to 30 cm in height.
Related Plants
Here are some related plants in the Polygonaceae family:
- Polygonum aviculare
- Rumex acetosella
- Rheum rhabarbarum
- Persicaria maculosa
References
- USDA Plants Database: Illecebrum verticillatum
- Missouri Botanical Garden: Illecebrum verticillatum
- Flora of North America: Illecebrum verticillatum
