Roundleaf dogwood (Cornus rugosa) is found in northeast Iowa. It is a perennial shrub, grows 3-10 feet tall, has green smooth stems with warts. The flowers are white, 4-parted; inflorescence 1 ½ - 2 ½ inches, branched clusters, and blooms in May-June. The leaves are opposite, stalked, broadly ovate, and pale and softly hairy below, and prefers shaded areas.
Habitat: Found in fertile upland woods and on north facing wooded slopes.
Hardiness: Zones 2 through 5
Growth Rate: Moderate
Height: 10 feet
Width: 8-10 feet
Site Requirements: Partial shade to full shade in dry soils to well-drained sandy loam soils
Flowering Dates: May - June
Seed Dispersal Dates: September - October
Seed Bearing Age: 2-6 years
Seed Bearing Frequency: Yearly
Seed Stratification: Prechill at 41°F for 3 months