Overview
Quercus sadleriana is a rare, rhizomatous, evergreen shrub oak native to the Klamath-Siskiyou region of northern California and southern Oregon. Plants reach 2–6 feet (0.6–1.8 m) tall and spread indefinitely by rhizomes, forming dense colonies in the wild; individual stems grow slowly, 4–8 inches (10–20 cm) per year. The habit is suckering and colony-forming. Leaves are 2.5–4 inches (6–10 cm) long, oval to oblong, dark green above and paler beneath, with 8–15 prominent parallel secondary veins terminating in mucronate (sharp-pointed) teeth along the margins, closely resembling chestnut (Castanea) leaves. Stipules are persistent, golden-silky, up to 0.6 inch (15 mm) long — a distinctive diagnostic feature. Acorns are small, produced after several years. The species is considered rare and of conservation concern within its limited native range. It performs poorly in hot, dry conditions outside its native fog-influenced range.
Native Range
Quercus sadleriana is native to the Klamath-Siskiyou region of northwestern California (Del Norte, Siskiyou, and Trinity counties) and adjacent southwestern Oregon, typically in mixed conifer forests and serpentine chaparral at elevations of 2,000–7,000 feet (600–2,100 m).Suggested Uses
Planted in native plant gardens, woodland understory plantings, and conservation-oriented landscapes where the rhizomatous, colony-forming habit can be accommodated, spaced 4–6 feet (1.2–1.8 m) apart. The chestnut-like foliage and regional native origin make this a botanically significant specimen in collections focused on Pacific Northwest and Klamath flora. Best suited to partly shaded, well-drained sites; not suitable for irrigated lowland gardens.How to Identify
Appearance
Size & Dimensions
Height2' - 6'
Width/Spread4' - 10'
Reaches mature size in approximately 8 years
Colors
Bloom Information
Male catkins are pendulous, 1–2 inches (2.5–5 cm) long, yellow-green, releasing pollen in April–May. Female flowers are inconspicuous, at leaf axils. Acorns mature in the second year, small, enclosed one-third to one-half in a scaly cup.Detailed Descriptions
Flower Description
yellow-green (male catkins)Foliage Description
dark green above, paler beneathGrowing Conditions
Sun Requirements
Requires 4-10 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight