Plant Data Sheet
Pacific Rhododendron Rhododendron macrophyllum
picture taken from http://www.cnr.vt.edu/dendro/dendrology/syllabus/rmacrophyllum.htm
Moist to dry climate found from the coast to middle elevations.
Local occurrence (where, how common)
common understory in mixed conifer forests. Less abundant in
National Wetland Indicator species, however no anaerobic tolerance.
Plant strategy type/successional stage (stress-tolerator, competitor, weedy/colonizer, seral, late successional)
No information on succession other than “This species sprouts well after fire or cutting and brings an encouraging touch of colour to cleared areas.” (Pojar/Makinnon) This suggests a colonizer habit.
May be collected as: (seed, layered, divisions, etc.)
Propagated by seed, cuttings.
Collection restrictions or guidelines
Collect seed late summer to early fall.
Seed germination (needs dormancy breaking?)
The seeds require light for germination.
Seed life (can be stored, short shelf-life, long shelf-life)
Pacific rhododendron seeds germinate without stratification and are viable for up to 2 years.
Recommended seed storage conditions
A cool, dry, dark place is recommended.
Propagation recommendations (plant seeds, vegetative parts, cuttings, etc.)
Seedling vigor is medium
Soil or medium requirements (inoculum necessary?)
Moist well drained
soil, low nitrogen availability.
Installation form (form, potential for successful outcomes, cost)
Container plants grown from seed or cutting.
Recommended planting density
Care requirements after installed (water weekly, water once etc.)
Aeration is a key requirement due to its shallow root system, as is a moist acidic soil.
Normal rate of growth or spread; lifespan
Perennial. The flowers are pollinated by bees and plants begin to bear seed when they are 5 years old. Pacific rhododendron seeds germinate without stratification and are viable for up to 2 years. The seeds require light for germination. The will typically reach 3 m at 10 yrs. They reach up to 5m at maturity. If aboveground portions are killed, Pacific rhododendron can regenerate vegetatively by sprouting from stem bases and from the rootcrown.
C. Leo; Cronquist, Arthur. Flora of the
Andy; Pojar, Jim. Plants of the
Data compiled by