Overview
Alnus rhombifolia is a spreading branched, columnar upright trees in the genus Alnus, part of the Betulaceae family, with deciduous foliage. Alnus rhombifolia grows best in full sun, and tolerates clay and loam soils and any pH. Its UK hardiness is rated H6. Suggested uses include architectural.
About
Alnus rhombifolia, commonly known as white alder or Californian alder, is a deciduous tree within the Alnus genus, which includes robust trees and large shrubs with rounded foliage and prominent winter catkins. This cultivar exhibits a spreading branched to columnar upright habit and thrives in full sun across various aspects and exposures. It is adaptable to clay and loam soils with a range of pH levels, including poorly-drained conditions. Hardy to UK zone H6, it is suitable for architectural planting and is best cultivated in well-drained soil with sun or part shade.
Growing conditions
Best soil and position for Alnus
- Sunlight
- Full sun
- Soil type
- Clay, Loam
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Poorly-drained
- Aspect
- East-facing, North-facing, South-facing, West-facing
- Exposure
- Exposed, Sheltered
- UK hardiness
- H6
Plant details
Alnus rhombifolia size, habit and characteristics
- Plant type
- Trees
- Habit
- Spreading branched, Columnar upright
- Foliage
- Deciduous
- Suggested uses
- Architectural
Care notes
Pruning and caring for Alnus rhombifolia
- Propagation
- Propagate by hardwood cuttings or seed. For more advice see our information on how to propagate from seed (tree/shrub
- Pest resistance
- May be susceptible to alder leaf beetle, alder sucker and leaf-mining sawflies
- Disease resistance
- May be susceptible to phytophthora root rot and honey fungus
Frequently asked questions
Where is the best place to plant Alnus rhombifolia?
Alnus rhombifolia prefers full sun. It suits exposed and sheltered positions.
What soil does Alnus rhombifolia need?
Alnus rhombifolia grows best in clay and loam soil. It is happy in soil of any pH. Aim for soil that stays poorly-drained.
Is Alnus rhombifolia hardy in the UK?
Alnus rhombifolia has an RHS hardiness rating of H6, meaning it is very hardy, tolerating -20 to -15°C across most of the UK.
How do I propagate Alnus rhombifolia?
Propagate by hardwood cuttings or seed. For more advice see our information on how to propagate from seed (tree/shrub.
