Cynoglossum

Description

Cynoglossum, commonly known as hound’s tongue, is a genus of flowering plants in the Boraginaceae family. Native to Europe, Asia, and North America, Cynoglossum species are biennial or perennial herbs that can grow up to 1.2 meters tall. The name “hound’s tongue” is derived from the plant’s leaves, which are covered in stiff hairs and feel rough like a dog’s tongue. Cynoglossum plants are known for their blue or purple flowers, which grow in clusters and bloom from May to August.

Taxonomic Information

Appearance

Cynoglossum plants have large, lance-shaped leaves that grow up to 25 centimeters long and 10 centimeters wide. The leaves are covered in stiff hairs that give them a rough texture. The stems of Cynoglossum plants are also hairy and can be reddish in color. The flowers of Cynoglossum plants are small and tubular, with five petals that are fused at the base. The flowers are typically blue or purple in color, although some species have white or pink flowers. Cynoglossum plants produce small, nut-like fruits that are covered in prickly hairs.

Care Guide

Cynoglossum plants are relatively easy to care for and can thrive in a variety of growing conditions. Here are some tips for caring for Cynoglossum:- Water: Cynoglossum plants prefer moist, well-draining soil. Water them regularly, especially during hot, dry weather.- Fertilization: Cynoglossum plants don’t require much fertilizer, but you can give them a light application of a balanced fertilizer in the spring.- Soil: Cynoglossum plants prefer well-draining soil that is rich in organic matter. They can tolerate a range of soil types, from sandy to clayey.- Sunlight: Cynoglossum plants prefer partial shade to full sun. They can tolerate some shade, but too much shade can cause them to become leggy.- Hardiness Zones: Cynoglossum plants are hardy in USDA zones 3-8.

Common Pests & Diseases

Cynoglossum plants are generally resistant to pests and diseases. However, they can occasionally be affected by the following:- Aphids: These small, soft-bodied insects can suck the sap from Cynoglossum plants, causing stunted growth and distorted leaves. You can control aphids by spraying the plants with a strong jet of water or applying insecticidal soap.- Slugs and snails: These pests can chew holes in the leaves of Cynoglossum plants. You can control them by handpicking them or using slug bait.- Powdery mildew: This fungal disease can cause a powdery white coating to form on the leaves of Cynoglossum plants. You can control it by improving air circulation around the plants and applying fungicide if necessary.

Habitat

Cynoglossum plants are native to a wide range of habitats, from meadows and woodlands to rocky slopes and disturbed areas. They can tolerate a range of soil types and growing conditions, from dry to moist and sunny to shady. Cynoglossum plants are common in Europe, Asia, and North America, and many species have been introduced to other parts of the world as ornamental plants.

Question and Answer

Q: Are Cynoglossum plants poisonous?

A: Yes, Cynoglossum plants contain pyrrolizidine alkaloids, which can be toxic if ingested by humans or animals.

Q: Can Cynoglossum plants be grown in containers?

A: Yes, Cynoglossum plants can be grown in containers as long as the container is large enough and the soil is kept moist.

Q: How often should I fertilize my Cynoglossum plants?

A: Cynoglossum plants don’t require much fertilizer, so a light application in the spring should be sufficient.

Q: Can Cynoglossum plants be propagated from cuttings?

A: Yes, Cynoglossum plants can be propagated from stem cuttings taken in the spring or summer.

Related Plants

Here are some related plants in the Boraginaceae family:- Forget-me-not (Myosotis)- Lungwort (Pulmonaria)- Borage (Borago)- Comfrey (Symphytum)

References

– “Cynoglossum”. Flora of China. Retrieved 2021-08-27.- “Cynoglossum”. Missouri Botanical Garden. Retrieved 2021-08-27.- “Hound’s Tongue”. Virginia Tech Weed Identification Guide. Retrieved 2021-08-27.