Kalopanax septemlobus – prickly castor oil tree

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Araliaceae

Kalopanax septemlobus – prickly castor oil tree

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Kalopanax septemlobus is a very distinctive tree, somewhat similar to Aralia, of which it is related. Yet the tree clearly differs from it in several respects. K. septemlobus grows distinctly upright and reaches 10 to 15 m in height. In exceptional cases, the tree can grow more than 20 m tall. The thick twigs are covered with sharp spines. On the older bark, these disappear after which the bark becomes grooved. The large leaves are mainly at the tips of the twigs. They are palmately lobed with the lobes varying in depth. The leaves unfurl quite light green and are a glossy dark green in summer. In autumn, it turns deep yellow to yellow-brown before falling off. In late summer, the broad, umbel-shaped panicles of small white flowers appear. The individual flowers are arranged in globular bundles, which together form the panicles. The panicles are about 30 cm long and wide and are crowded by bees. After flowering, the small blue-black berries appear, which are also ornamental.
K. septemlobus grows best in nutrient-rich, moist soil, in full sun. By nature, it is a tree that grows at the bottom of mountain slopes and along river banks. Does not tolerate paving and is therefore a park tree par excellence.

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Specifications
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Height
10-15(25) m
Width
10-15m
Crown
round/spherical, light, open crown, capricious growing
Bark and branches
trunks set with many spines
Leaf
green
Flowers
white, flowers in July
Fruits
blue, black
Spines/thorns
Yes
Toxicity
usually not toxic to people, (large) pets and livestock
Soil type
clayed soil, loamy soil, sandy soil, peaty soil
Paving
tolerates no paving
Winter hardiness zone
5b (-26,0 to -23,4 °C)
Wind resistance
good
Other resistances
resistant to frost (WH 1 - 6)
Application
industrial areas
Shape
multi-stem treem
Multi-stem tree clay soil loamy soil peaty soil sandy soil tolerates no paving resistant to frost (WH 1 - 6) 3rd size, smaller than 6 metres open crown green white July average growing Conspicuous bloom non-toxic (usually) Capricious growing yes
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Frequently asked questions
Kalopanax septemlobus

Kalopanax septemlobus can eventually reach a height of 10-15(25) m, depending on the site and climate conditions.

Kalopanax septemlobus is average growing and can eventually reach a height of 10-15(25) m, depending on the site and climate conditions.

The right time to plant Kalopanax septemlobus is during the dormancy period. In Western Europe, Kalopanax septemlobus with root balls can generally be planted from mid-November to late April, although this depends strongly on the climatic conditions and the species of tree.

Kalopanax septemlobus blooms in july.
General

Yes, we deliver to the UK. Delivery costs depend on the region and the total order value. Below, you’ll find all the details.

Delivery charges for private customers are calculated based on your region and are visible during the checkout process. We also offer discounts based on the total value of your order:

  • Orders over £1,000: Receive a 50% discount on delivery costs.
  • Orders over £2,000: Delivery is completely free.

Yes, for trees with a size of 50-60 cm girth or larger, additional delivery charges apply due to the need for specialised transport. These costs will be calculated separately and shared with you after your order is placed. We will contact you to discuss the transport options and costs.

Once you add items to your basket and proceed to the checkout, the system will calculate the delivery charges for your region. If your order qualifies for any discounts, they will automatically be applied.

For any questions or specific delivery requests, feel free to contact our customer service team. We’re happy to help arrange the best delivery solution for your order.