Castilleja Unalaschcensis

Taxonomic Information

Description: Castilleja Unalaschcensis, commonly known as Aleutian Indian paintbrush, is a flowering plant species native to Alaska, particularly in the Aleutian Islands. It is a perennial herb that grows up to 10-30 cm tall with multiple stems. The plant’s leaves are narrow and lance-shaped, with a length of 0.5-3 cm. Castilleja Unalaschcensis blooms from May to July, producing showy red, yellow, or orange bracts that resemble a paintbrush’s head.

Appearance

The plant’s showy bracts make it an attractive addition to gardens and landscaping projects. The flowers are typically red, yellow, or orange, with the bracts surrounding them measuring up to 4 cm long. The leaves are narrow and lance-shaped, with a dark green hue. The stems are green and hairy, with multiple branches that produce the flowers. Castilleja Unalaschcensis grows up to 10-30 cm tall, making it a relatively small plant that is perfect for small gardens, planters, or rock gardens.

Care Guide

Water: Castilleja Unalaschcensis prefers moist but well-draining soil. Water the plant regularly, especially during dry spells, but avoid overwatering, which can cause root rot.

Fertilization: This plant does not require frequent fertilization. However, you can add compost or slow-release fertilizer to the soil in the spring to help it grow better.

Soil: Castilleja Unalaschcensis prefer rich, slightly acidic soil with a pH range of 5.5 to 6.5. Make sure the soil is well-draining to avoid waterlogging.

Sunlight: This plant prefers full sun, but it can tolerate partial shade. Make sure it gets at least six hours of sunlight a day.

Hardiness Zones: Castilleja Unalaschcensis grows best in USDA hardiness zones 3 to 8.

Common Pests & Diseases

Castilleja Unalaschcensis is relatively resistant to pests and diseases. However, it can be susceptible to aphids, spider mites, and powdery mildew. To prevent these problems, keep the plant healthy by watering it regularly and avoiding overcrowding. If you notice any signs of infestation or disease, treat the plant with insecticides or fungicides as needed.

Habitat

Castilleja Unalaschcensis is native to Alaska, particularly in the Aleutian Islands. It grows in meadows, tundra, and rocky slopes, where it can tolerate the harsh climate and soil conditions. This plant is an important food source for pollinators such as bees and butterflies.

Question and Answer

Q: Is Castilleja Unalaschcensis easy to grow?

A: Yes, this plant is relatively easy to grow, as long as you provide it with the right care and conditions.

Q: Can Castilleja Unalaschcensis be grown in containers?

A: Yes, this plant can be grown in containers or pots, as long as the soil is well-draining and the container is the right size for the plant’s roots.

Q: How often should I water Castilleja Unalaschcensis?

A: Water the plant regularly, especially during dry spells, but avoid overwatering, which can cause root rot.

Q: What is the best time to plant Castilleja Unalaschcensis?

A: The best time to plant this plant is in the spring or fall, when the weather is mild and the soil is moist.

Related Plants

• Castilleja Miniata
• Castilleja Chromosa
• Castilleja Rhexifolia
• Castilleja Sulphurea

References

• “Castilleja Unalaschcensis.” Wildflower Center. Accessed September 22, 2021. https://www.wildflower.org/plants/result.php?id_plant=CAUN.
• “Castilleja Unalaschcensis.” USDA Plants Database. Accessed September 22, 2021. https://plants.usda.gov/home/plantProfile?symbol=CAUN.
• “Aleutian Indian Paintbrush.” Alaska Native Plant Society. Accessed September 22, 2021. https://www.aknps.org/index.php/garden-tips-articles/85-aleutian-indian-paintbrush.