Crocanthemum scoparium

Crocanthemum scoparium, commonly known as the Broom-Like Frostweed or Peak Rushrose, is a small, drought-tolerant shrub native to North America, particularly in coastal and inland chaparral ecosystems of California, Baja California, and surrounding regions. It is a member of the Cistaceae family, which is well-known for its hardy, sun-loving plants adapted to dry climates. The plant is recognized for its upright, broom-like branches, which give it a distinctive appearance and its common name. It typically grows to about 1–3 feet (30–90 cm) tall.

Crocanthemum scoparium
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Malvales
Family:	Cistaceae
Genus:	Crocanthemum
Species:	C. scoparium
Binomial name
Crocanthemum scoparium (Nutt.) Millsp.
Synonyms
Helianthemum scoparium Nutt. Helianthemum suffrutescens

Leaves & Flowers

The leaves of Crocanthemum scoparium are slender, lance-shaped, and evergreen, ranging from 0.5 to 2 inches (1.2–5 cm) long. The upper surface of the leaves is smooth, while the underside is slightly hairy. The green, needle-like leaves make this plant look somewhat similar to broom plants, contributing to its "broom-like" descriptor. The flowers are small and delicate, with five bright yellow petals, typically blooming from late spring to early summer (April to July). These flowers, though short-lived, attract pollinators like bees and butterflies. The bloom period usually lasts for a few weeks.

Habitat & Distribution

Crocanthemum scoparium thrives in dry, sandy, or rocky soils and is adapted to full sun exposure. It is often found in coastal sage scrub, chaparral, and desert scrub habitats. The plant is highly drought-tolerant and has evolved to survive in low-water conditions, making it an important species in xeriscaping and native plant gardens. The plant is native to the western United States and northern Mexico. In the U.S., its range includes southern California, Nevada, and Arizona, particularly in regions with Mediterranean climates. In Baja California, it grows in similar coastal and inland habitats.

Ecological Importance & Conservation

Crocanthemum scoparium plays a significant role in maintaining the ecological balance of chaparral and scrubland habitats. It provides shelter for small animals and insects and is an essential nectar source for native pollinators. Its ability to survive in poor soils also helps prevent soil erosion. While Crocanthemum scoparium is not currently listed as threatened or endangered, habitat loss due to urbanization and agricultural expansion poses risks to its natural populations. Conservation efforts focus on preserving its native habitats, particularly in regions undergoing rapid development.

Uses & Cultivation

Due to its attractive yellow flowers and drought tolerance, Crocanthemum scoparium is increasingly used in native plant gardens and ecological restoration projects. It requires minimal water once established, making it an ideal choice for xeriscaping in arid climates. Additionally, it helps support local biodiversity by attracting pollinators and other wildlife. When cultivating Crocanthemum scoparium, it's important to replicate its natural environment by planting it in well-drained, sandy, or rocky soils with full sun exposure. It is relatively low-maintenance and can thrive with minimal watering once established. Pruning may be necessary to maintain its shape and encourage healthy growth.

External links

• Jepson eFlora: Crocanthemum scoparium
• Jepson Manual Treatment of Helianthemum scoparium
• Helianthemum scoparium — Photo gallery