Collomia linearis: complete guide

Collomia linearis, known by many names including Tiny Trumpet, Narrow-leaf Mountain-trumpet, and Narrowleaf Mountaintrumpet, is a charming small herb from the Polemoniaceae family. This plant originates from western Canada and the western to west-central portions of the United States. In temperate climates, this interesting little plant can be grown in dry gardens and wildflower meadows.

The plant grows as a low, herbaceous specimen typically reaching 15 to 40 centimeters in height. The leaves are narrow and linear, resembling grassy vegetation. In July and August, the plant produces tiny funnel-shaped flowers in shades ranging from white to pink to orange. The flowers are very small, approximately 0.5 cm in diameter, but are produced in large quantities.

Collomia linearis thrives best in full sun and in warm, dry locations. The plant prefers well-draining, slightly poor soil. In temperate climates, this plant is best cultivated in dry sunny gardens, on rock and gravel gardens, and in wildflower meadows. The plant self-seeds freely and can be used as a self-seeding groundcover in dry areas.

When planting, it is important to position the plant in a very well-draining location. Add sand or gravel to the soil to improve drainage. This plant tolerates very dry conditions and is actually quite sensitive to excessive water. This makes it perfect for dry, sunny garden corners that are difficult to fill.

Watering should be limited, especially once the plant is established. For young plants, water regularly until they are well-established, then drastically reduce watering. Established plants need virtually no water and can thrive entirely on rainfall.

Feeding is unnecessary for this plant. Excess fertilizer can lead to lush growth without many flowers. Poor soil is actually beneficial for this plant, as it forces the plant to invest energy in flower production.

Collomia linearis is not winter-hardy in temperate climates. The plant can, however, be easily grown from seed. Seeds are sown directly in the ground in late spring (May), or can be started indoors in March for raising seedlings to pot up. The plant will then produce its own seed for the following season.

Pests are rarely a problem for this plant. In very humid conditions, however, aphids may sometimes appear. This plant loves to be dry and sunny, so a dry growing location prevents most problems.

Collomia linearis is an excellent plant for perennial wildflower meadows, dry wildflower gardens, and for filling difficult dry corners in the garden. The plant looks beautiful when planted in groups and can be used to create fine textural effects in garden design.

This plant is also well-suited for cut flowers during summer. The delicate, fine flowers look lovely in airy bouquets. The plant flowers continuously from July to October, making it a very useful addition to the summer garden.

Seed can be collected from mature plants in September and October. Dry the seed thoroughly before storing in a cool, dry place. Seeds remain viable for a long time.

Collomia linearis is an underappreciated little herb that deserves much wider use in gardens. The plant works well with other dry soil-loving plants, lavender, and other wildflowers. If you enjoy wildflower gardens and dry ground planting, definitely try this charming little plant. Seeds are easy to find from seed suppliers online or at larger garden centers.