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B and T World Seeds' reference number:
The average, annual, minimum temperature zone where Rhododendron macrophyllum is cold hardy
USDA Zone:6 -10° to 0°F (-23.5° to -18°C)
|Type of plant - evergreen shrub
Flower or inflorescence:
ROSE-PURPLE, dark spots, 6cm. campanulate
....(surface sow on sand - peat, bag pots, 2-16 weeks at ~ 13deg.C)
br. ell., 6.5-17cm. long, aromatic
|Height, in meters: 4
Height, in feet: 13.20
|Rhododendron macrophyllum seeds may be subject to seasonal availability
| Parts of Rhododendron macrophyllum are considered toxic.
Synonyms (alternative names) for Rhododendron macrophyllum:
|Rhododendron californicum, Rhododendron macrophyllum,|
Common names for Rhododendron macrophyllum:
|Bigleaf Rhododendron, California Rose Bay, California Rose-Bay, Coast Rhododendron, Pacific Rhododendron,|
is included in the following
B and T World Seeds flowering plant categories.
|10||: Rhododendron and Azalea Species and Hybrid Seed List|
|40||: Shrub Seed List, Hardy and Tender|
|65||: World Coastal Tree and Plant Seed List|
|76||: Californian Native Plant Seed List|
|88||: Natives of U.S.North West|
|131||: Toxic Plants|
|Some of the deadliest known poisons are found in plants. Some major food plants, eaten by millions of people every day, have toxic parts.|
|185||: Plant Species whose germination is improved by Smoke|
|"Smoke" contains a butenolide compound produced by certain plants when heated, it speeds up or starts the germination of seeds from many different genera.|
|719||: North American Native Ethnobotanicals|
|Including medicinal, dye, fiber, food, construction, ritual|
Some knowledge about growing from seed is necessary to germinate even the easiest seeds.
Most seeds require humidity to germinate, even desert plants like
require that their growing medium remains moist until germination.|
Most seeds require oxygen to germinate, if buried too deep in their growing medium, or if the medium is too wet,
the seeds may not get the oxygen they require.
Rhododendron macrophyllum seeds will usually germinate in 50-90 days, even under good conditions germination may be erratic.
Rhododendron macrophyllum seeds will mostly germinate as the weather warms up in Spring, some may germinate during the Summer or Autumn but are more likely to stay dormant until the following Spring.
Keep shaded from direct sun.