Common Hawkweed
Hieracium lachenalii · Herbaceous Perennial (Herb/Wildflower)
Plant Family
Asteraceae
Tree Category
Wildflower / Weed
Variety / Cultivar
None (Wild type species)
Hardiness Zones
USDA Zones 3 through 8.
About This Tree
Though not a tree, it is an upright herbaceous perennial growing from a basal rosette. It features hairy, unbranched or sparsely branched stems that terminate in clusters of bright yellow dandelion-like flower heads. The plant reaches a modest height but can form dense colonies via seeds.
Leaf Characteristics
Basal leaves are lanceolate to ovate, hairy on both sides, often with jagged margins or teeth. Stem leaves (when present) are few and much smaller than basal leaves. Color is medium green.
Bark Characteristics
Not applicable (herbaceous). The stems are green or reddish-purple, covered in stiff, bristly hairs (trichomes) and sometimes milky sap.
Growing Information
Origin Region
Native to Europe and Western Asia; naturalized in North America and Oceania.
Growing Season
Spring and summer growth; flowers appear from June through September followed by seed dispersal via wind.
Sunlight & Water Needs
Full sun to partial shade. Prefers well-drained, nutrient-poor or disturbed soils. Relatively drought-tolerant once established.
Mature Size
Mature height of 1 to 3 feet (30-90 cm); spread varies as it can colonize through seeds; growth rate is moderate to fast.
Special Characteristics
Known for high seed production and a deep taproot. It is often considered a noxious weed in some regions due to its ability to outcompete native grasses and forage.
Wildlife & Ecology
Provides nectar and pollen for various small bees and hoverflies. The seeds are occasionally consumed by small birds. Its presence often indicates disturbed or acidic soil conditions.