Alnus Glutinosa is a distinct plant that attracts many species of birds and insects each year, with its wonderful, dense, bushy nature that makes it ideal for habitats.
About Alder Hedging
Alder hedging is a deciduous, fast-growing species which produces long catkins in Spring, following with little, wood-like cones in Autumn. It is particularly wildlife-friendly, which is a lovely bonus, and is tolerant to wet/poor-quality soils, making it somewhat hardy and durable. It is the ideal choice for a coastal or waterside garden.
Key Features
Alder has a fast growth rate of 60cm per year and can reach an ultimate height of 5m.
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Growth rate: fast (40-60cm per year)
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Ideal height: 5m+ Tall
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Soil type: Wet, very wet
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Exposure: Sheltered, exposed, coastal, inland
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Aspect: Full sun
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Evergreen foliage? No
Pruning & Care
You should only trim your Alder hedging in late Autumn. Make sure you only prune at this time, as you do not want to remove any new, growing shoots.
Even though it is deciduous, Alder does begin producing some new shoots in Winter.
How To Plant Alder
When should I plant Alder hedging?
As Alder plants are generally sold as bare root, you can only plant from November - March, but only if the soil is not frozen. In general, late autumn is the best time to plant your Alder plants, with there being as little risk as possible with transplanting at that time.
How far apart should I plant Alder plants?
Bare root plants need to be planted quite close together to get the best results. This means planting at least 5 plants per metre (20cm spacing). You can go for as many as 7 per metre, for smaller 40/60cm sized plants, if you're keen on getting a dense hedge as quickly as possible.
How to plant Alder:
Planting your Alder plants is simple, but the trick with bare roots is ensuring they get plenty of water before going in the ground.
Begin with soaking the roots for at least 2 hours in a bucket of water. You can also spray the roots with a garden hose for a few minutes if you do not have a bucket to hand or you have too many to put into containers.
Whilst the roots are soaking, dig the trench/individual holes (if you haven't already). The hole will need to be at least twice as wide as the plant's root mass, but the same depth. Following this, place the soaked roots into the hole(s), and fill back in with the excess soil. Pat down the soil as you go along, to ensure as little air pockets are left as possible.
Water the plants very well and continue to regularly water for the next 1-2 years after planting (this is a very important step, as Alder particularly prefers wet soils).