Alnus glutinosa 'Imperialis', commonly known as the Cut Leaved Alder tree makes a beautiful, slender tree with finely cut, feathery green foliage. The foliage is a wonderful feature giving the tree a slightly oriental appearance. Catkins appear in spring and false cones follow, which are popular with the birds. Yellow autumn colours make this, the smaller of the Alnus varieties, a very attractive tree for smaller gardens.
Ideal for difficult sites, Alnus glutinosa 'Imperialis' thrives in damp conditions and is able to tolerate exposure. A height and spread of 6 x 4 metres can be expected in 20 years. An additional quality of Alder trees is that they host nitrogen fixing bacterium beneath the soil which improves the fertility of the soil.
AKA Cut Leaved Alder, Alnus glutinosa Imperialis
Our pot grown Cut Leaved Alder trees can be planted at any time of the year, unlike bare root trees. Start by removing weeds and grass within a metre of your intended planting hole. Dig a square hole as deep as your root mass and approximately 2x as wide. To help your tree establish more effectively, especially if you have poor soil, we advise sprinkling root grow in the hole.
Take the pot off and gently loosen the tree roots, then place into the planting hole. Mix 50% of the original soil with 50% compost, then fill in the hole and firm around gently. Make sure not to bank the soil up around the collar of the tree. We advise planting young trees with a stake and tie kit and, if your area is prone to rabbits, a rabbit guard.
If you’re planting in spring, summer or dry weather, water well and regularly for the first few months. Make sure to keep an eye on young Cut Leaved Alder trees and increase watering if there are extended periods of hot or dry weather. If you’re planting in autumn, you may only need to water your tree a little. We stock a range of irrigation kits, suitable for a variety of planting schemes.
Once planted, it is important to keep the area free of competing weeds and grass for the first couple of growing seasons.
Like most ornamental trees, Cut Leaved Alder trees do not require much pruning once they have established. Simply remove any crossing, damaged or diseased branches. Prune in late winter or early spring. If you think the canopy is overcrowded, make sure to alleviate the branches to ensure enough air and light can penetrate. Alder trees produce their own nitrogen so they do not require fertiliser, only a consistently moist soil.
All trees are carefully packed by our experienced team and most are delivered within 10 days of placing the order. There's no need to be in to receive your order and you can request where it is left via the checkout.
There is a slightly longer timescale on pleached and mature trees (trees over 2.5m in height) because we group orders together for specialist delivery - we will contact these customers to notify them of the delivery date.
Trees on pre-order are still growing and an estimate of when they will be ready is given on the basket page. Orders will be despatched when all trees are ready.
Gift trees and those required by a specific date can be accommodated with pleasure, although we accept no legal responsibility for late deliveries.
Our nursery is a busy despatch centre, so please make an appointment to collect or view trees. For collections, despatch charges will be refunded.
1 small tree (most trees under 1.5 metres in height) : £7.95 + vat
1 medium tree (most trees 1.5-2 metres in height) or 2-4 small trees: £9.95 + vat
2+ medium trees or 5+ small trees: £12.95 + vat
1-4 trees delivered by pallet (inc. mature Japanese Maples): £19.95 + vat
The above prices exclude the Scottish Highlands, where delivery starts from £24.95 + vat and is calculated in the checkout process.
Mature and pleached trees or orders too large for pallet: Cost is calculated in the checkout process and varies by postcode rather than quantity (starts from £48 + vat).
Our courier charges are not viable for just one or two trees, but if you have a larger requirement then please do speak to us to see if we can find a solution.
The product table at the bottom of the page gives the forms and sizes available for this variety. Please note, photos are a guideline as all plants are unique. Below are definitions of terms:
Supplied Size: Height measured from the top of the pot.
Single Stem / Pruned and shaped: Classic shaped tree with a single stem that has had pruning to help create a beautiful, natural shape.
Top grafted: A height noted next to this form refers to the length of clear stem, which will not grow taller. Only the head of branches will develop. Top grafted trees do not require complicated pruning and are ideal for small spaces.
Feathered: A feathered tree has branches from the bottom of the trunk all the way up. These branches can be removed if a clear stem is required.
Multi Stem: A multi stem tree has two or more stems arising from or near ground level, growing from one root system.
Bush: A plant with many stems low down, rather than one clear stem.
Clump: Several plants in one pot that can give the appearance of a multi stemmed and very bushy tree.
Climber: A plant that is a natural climber and will be delivered usually running up a bamboo cane, ready to position in the garden.
Standard Tree: A more mature tree with an upright clear stem of approximately 1.8m-2.0m (measured from the soil to the lowest branches of the crown). Standards are available in different forms relating to their girth size (circumference of the stem measured 1m above soil level), not height:
Standard either 6-10cm or 8-10cm girth, approximately 2.5-3.0m in height
Premium Standard 10-12cm girth, approximately 3.0-3.5m in height
Heavy Standard 12-14cm girth, approximately 3.5-4.5m in height
Extra Heavy Standard 14-16cm girth approximately 4.0-6m in height
|Plant Specification||Form||Supplied Size||Root type||Price||Quantity Qty|
|Single Stem Tree||150-200cm||10L pot||£49.99 (ex VAT)|