Althaea

Description

Althaea, commonly known as marshmallow, is a genus of flowering plants in the mallow family (Malvaceae). This herbaceous perennial is native to Europe, Western Asia, and North Africa, but has been introduced to other parts of the world. Althaea plants grow up to 4 feet tall and produce clusters of pink, white, or mauve-colored flowers. The leaves of this plant are ovate, with serrated edges and a velvety texture. The roots of Althaea plants have been used for medicinal purposes since ancient times, and are still used today to make herbal remedies for coughs, sore throats, and digestive issues.

Taxonomic Information

Appearance

Althaea plants have an upright growth habit and can reach up to 4 feet in height. The leaves of this plant are ovate, with serrated edges and a velvety texture. They are typically green in color, but can also be variegated. Althaea plants produce clusters of pink, white, or mauve-colored flowers, which bloom from mid-summer to early fall. The flowers are similar in appearance to hibiscus flowers, with five petals and a prominent central stamen. They are attractive to bees and butterflies, and can be used in cut flower arrangements.

Care Guide

Althaea plants are relatively easy to care for and can thrive in a variety of growing conditions. Here are some tips for growing and caring for Althaea:

Water: Althaea plants prefer consistently moist soil, but can tolerate some drought. Water regularly, especially during periods of dry weather.

Fertilization: Apply a balanced fertilizer in spring, and again in mid-summer. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flowers.

Soil: Althaea plants prefer well-draining soil that is rich in organic matter. They can tolerate a wide range of soil types, but do best in slightly acidic soil with a pH of 6.0 to 7.0.

Sunlight: Althaea plants prefer full sun, but can also tolerate partial shade. Provide at least 6 hours of direct sunlight per day for best results.

Hardiness Zones: Althaea plants are hardy in USDA zones 3-9, and can tolerate a wide range of temperatures.

Common Pests & Diseases

Althaea plants are relatively resistant to pests and diseases, but can still be affected by certain issues. Here are some common pests and diseases to watch out for:

Aphids: These small, soft-bodied insects can suck sap from Althaea plants, causing leaves to curl and turn yellow. Use insecticidal soap or neem oil to control aphids.

Spider mites: These tiny pests can cause leaves to become mottled and yellow. Use insecticidal soap or neem oil to control spider mites.

Rust: This fungal disease can cause orange, yellow, or brown spots to appear on leaves. Remove affected leaves and treat with a fungicide if necessary.

Habitat

Althaea plants are native to Europe, Western Asia, and North Africa, but have been introduced to other parts of the world. They prefer moist, marshy habitats, and can often be found growing near streams, ponds, or wetlands. Althaea plants are also commonly grown in gardens as ornamental plants.

Question and Answer

Q: Is Althaea poisonous?

A: No, Althaea is not poisonous. In fact, the roots of this plant have been used for medicinal purposes for centuries.

Q: How often should I water my Althaea plant?

A: Althaea plants prefer consistently moist soil, so water regularly to keep the soil damp but not waterlogged.

Q: Can I grow Althaea in a container?

A: Yes, Althaea can be grown in a container. Choose a large pot with good drainage, and use a high-quality potting mix. Water regularly, and fertilize as needed.

Q: How do I propagate Althaea?

A: Althaea can be propagated by seed or by division. Sow seeds in early spring, or divide established plants in early fall.

Related Plants

Here are some other plants in the Malvaceae family that are related to Althaea:

• Hibiscus
• Lavatera
• Abutilon
• Sida
• Gossypium

References

• “Althaea.” Missouri Botanical Garden. Accessed 22 March 2021. http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=281770&isprofile=0&basic=Althaea
• “Marshmallow (Althaea officinalis).” National Center for Complementary and Integrative Health. Accessed 22 March 2021. https://www.nccih.nih.gov/health/marshmallow
• “Althaea: Growing Guide.” Old Farmer’s Almanac. Accessed 22 March 2021. https://www.almanac.com/plant/althaea