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Alnus inokumae

Alder

Height
8m
Width
4m
Tree shape

Estimated size at 10 years

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Stock Info

Standard height
The height of the clear trunk before the graft and branching begins.
Low worked (LW)
Grafted, or allowed to branch, much lower on the trunk.
Clear trunk (CT) vs Bushy
Clear trunk has its branches trimmed up. Bushy is allowed to grow out from lower down.
Cloud pruned
Foliage shaped into distinct, rounded “clouds” on carefully spaced branches.

Alnus inokumae is a fast and straight-growing alder that features attractive, dark-green leaves. It is an excellent option for use as a fast-growing screening tree and is capable of tolerating wet sites. During the early to mid-spring months, it produces yellow-green catkins that serve as a source of pollen for bees. Additionally, Alnus inokumae can fix nitrogen in the soil, which is beneficial for improving soil conditions for other plants. In the autumn months, its leaves turn yellow, adding a lovely touch of color to any outdoor space. It is deciduous and native to the islands of Honshu and Hokkaido in Japan.

Also known as

Alnus hirsuta f. inokumae

Uses

  • Attracts Bees
  • Street Trees

Origin

  • Exotic

More about Alnus inokumae

Plant Details

Foliage Type
  • Deciduous
Position
  • Full sun
  • Partial shade
Soil Type
  • Clay

Seasonal Colour

FlowerSep–Nov

Foliage

This is a general guide. When a plant flowers, fruits and colours up depends on the climate where you live and on the season. If timing matters, please reach out to our team.

Foliage Type

Evergreen plants retain foliage year-round but still shed and replace some leaves gradually as part of their normal growth cycle, rather than losing them all at once.

Deciduous plants shed all their leaves for part of the year (usually in autumn and winter), usually in response to colder temperatures or dry seasons, often producing seasonal colour before leaf drop.

Semi-evergreen plants sit between the two, keeping most of their foliage but losing some or all leaves briefly under cooler or drier conditions before quickly regrowing them.

Soil Type

Chalky soil is alkaline and often contains visible pieces of chalk or limestone. It drains very quickly and can be low in nutrients, making it difficult for many plants to grow unless organic matter is added. Some plants, however, thrive in its free-draining, lime-rich conditions.

Rocky soil contains a high proportion of stones and gravel. It usually drains well but holds very little water or nutrients. Plant roots may struggle to establish, though hardy, drought-tolerant plants can adapt to it.

Sandy soil has large particles that feel gritty to the touch. It drains quickly and warms up fast in spring, but it does not retain moisture or nutrients well. Regular watering and the addition of compost can improve its fertility.

Loamy soil is a balanced mix of sand, silt, and clay. It holds moisture and nutrients well while still allowing excess water to drain, making it ideal for most plants. Loam is generally considered the best all-round soil for gardening and agriculture.

Clay soil is made up of very fine particles and feels smooth or sticky when wet. It retains water and nutrients well but drains poorly and can become compacted. With proper management, such as adding organic matter, clay soil can be very fertile.