Bidens

Description

Bidens, commonly known as beggarticks or bur marigold, is a genus of flowering plants in the aster family, Asteraceae. This genus comprises over 200 species of annual and perennial herbs, shrubs, and small trees. The name “Bidens” is derived from the Latin word “bis” (meaning twice) and “dens” (meaning tooth), referring to the two-pronged bristles on the seeds of many species in this genus.

Taxonomic Information

Appearance

Bidens plants have simple or compound leaves that are usually toothed or lobed. The flowers are small, yellow or orange, and daisy-like, with a central disk surrounded by several ray florets. Some species have prominent bracts or involucral leaves that resemble petals. The fruit is an achene with two barbed or hooked bristles that attach to clothing or fur, aiding in seed dispersal. The size and shape of Bidens plants vary widely depending on the species, ranging from a few inches to several feet tall.

Care Guide

Bidens plants are generally low-maintenance and easy to grow. They prefer well-draining soil and full sun but can tolerate some shade. They require regular watering, especially during hot and dry periods, but do not like to be waterlogged. Fertilization should be done sparingly, as too much nitrogen can result in excessive foliage growth at the expense of flowers. Bidens plants are hardy in USDA zones 3-11 and can tolerate light frost but may need protection in colder climates.

Common Pests & Diseases

Bidens plants are relatively resistant to pests and diseases but can be affected by spider mites, aphids, and whiteflies. These pests can be controlled with insecticidal soap or neem oil. Overwatering and poor drainage can lead to root rot, while powdery mildew can occur in humid conditions. These issues can be prevented by avoiding excessive watering and providing good air circulation.

Habitat

Bidens plants are native to North and South America but have been introduced to other parts of the world. They are commonly found in wetlands, meadows, and disturbed areas such as roadsides and fields. Some species, such as Bidens pilosa, have medicinal properties and are used in traditional medicine to treat a variety of ailments.

Question and Answer

Q: Can Bidens plants be grown in containers?

A: Yes, Bidens plants can be grown in containers as long as they have adequate drainage and are watered regularly.

Q: Do Bidens plants attract pollinators?

A: Yes, Bidens plants are attractive to bees, butterflies, and other pollinators.

Q: How often should Bidens plants be fertilized?

A: Bidens plants should be fertilized sparingly, no more than once a month during the growing season.

Q: How long do Bidens plants bloom?

A: Bidens plants typically bloom from midsummer to fall, depending on the species and growing conditions.

Related Plants

• Coreopsis
• Gaillardia
• Rudbeckia
• Solidago

References

• USDA Plants Database. (n.d.). Bidens. Retrieved from https://plants.usda.gov/core/profile?symbol=BIDEN
• Missouri Botanical Garden. (n.d.). Bidens. Retrieved from http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=279685&isprofile=0&
• University of Florida IFAS Extension. (2021). Bidens pilosa. Retrieved from https://edis.ifas.ufl.edu/pdffiles/AG/AG37300.pdf