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Description
Johnstonella angustifolia, commonly known as narrowleaf johnstonella or narrowleaf tansyaster, is a herbaceous perennial plant that belongs to the Asteraceae family. It is native to the western United States and Canada, and it can grow up to 3 feet tall. The plant has narrow, linear leaves that are about 1 inch long, and it produces small, yellow flowers that bloom from July to September. Johnstonella angustifolia is an excellent addition to any garden or landscape, and it is known for its attractive foliage and delicate blooms.
Taxonomic Information
| Domain | Eukarya |
| Kingdom | Plantae |
| Phylum | Angiosperms |
| Class | Eudicots |
| Order | Asterales |
| Family | Asteraceae |
| Genus | Johnstonella |
| Species | Angustifolia |
Appearance
Johnstonella angustifolia has narrow, linear leaves that are about 1 inch long and 1/8 inch wide. The leaves are grayish-green and have a slightly hairy texture. The plant produces small, yellow flowers that measure about 1/2 inch in diameter. The flowers bloom from July to September and are arranged in clusters at the top of the stem. The flowers have a central disk surrounded by yellow ray petals, and they are attractive to bees and butterflies.
Care Guide
Johnstonella angustifolia is a relatively low-maintenance plant that can thrive in a variety of conditions. Here are some care tips:
- Water: Water the plant regularly, especially during hot and dry weather. Avoid overwatering, as this can cause root rot.
- Fertilization: Fertilize the plant once a month during the growing season with a balanced fertilizer.
- Soil: The plant prefers well-draining soil that is rich in organic matter.
- Sunlight: The plant prefers full sun to partial shade.
- Hardiness Zones: Johnstonella angustifolia can grow in USDA hardiness zones 4 to 9.
Common Pests & Diseases
Johnstonella angustifolia is relatively resistant to pests and diseases. However, it can be susceptible to root rot if it is overwatered. Here are some common pests and diseases to watch out for:
- Aphids: These small insects can suck the sap from the plant, causing stunted growth and distorted foliage.
- Spider mites: These tiny pests can cause yellowing and stippling on the leaves.
- Powdery mildew: This fungal disease can cause a white, powdery coating on the leaves.
Habitat
Johnstonella angustifolia is native to the western United States and Canada, and it can be found in a variety of habitats, including meadows, prairies, and open woods. The plant prefers well-draining soil and full sun to partial shade. It is commonly used in gardens and landscapes as an ornamental plant, and it is known for its attractive foliage and delicate blooms.
Question and Answer
Q: Is Johnstonella angustifolia a drought-tolerant plant?
A: Yes, Johnstonella angustifolia can tolerate dry soil conditions, but it still needs regular watering during hot and dry weather.
Q: How tall does Johnstonella angustifolia grow?
A: Johnstonella angustifolia can grow up to 3 feet tall.
Q: What is the blooming season for Johnstonella angustifolia?
A: The plant produces small, yellow flowers that bloom from July to September.
Q: Can Johnstonella angustifolia grow in shade?
A: Yes, Johnstonella angustifolia can grow in partial shade, but it prefers full sun.
Related Plants
- Johnstonella occidentalis
- Johnstonella perplexa
- Johnstonella uniflora
References
- https://www.fs.fed.us/wildflowers/plant-of-the-week/johnstonella_angustifolia.shtml
- https://plants.usda.gov/core/profile?symbol=JOAN7
- https://www.wildflower.org/plants/result.php?id_plant=JOAN7
