Acer palmatum 'Seiryu' Care Guide
Congratulations — you are now the proud owner of an Acer palmatum 'Seiryu', a beautiful Japanese maple
With its finely cut, lacy green foliage and upright, gently layered habit, Acer palmatum 'Seiryu' is a wonderful addition to any garden or patio. Unlike most cut-leaf maples, which tend to cascade, the Seiryu grows into a neat, upright small tree, and its airy foliage turns a stunning mix of gold, crimson and orange in autumn.
When your plant arrives
Remove the packaging carefully and give your tree a little time to settle. Choose its spot before you move it, as acers dislike being moved about once they are happy. A little drooping or mild stress after travelling is normal, and your tree should soon settle with a steady routine.
Light
Choose a spot with dappled shade or gentle morning sun, with some shelter from harsh afternoon light. A little direct sun will deepen the autumn colour, but strong midday sunshine can scorch the delicate foliage, especially in summer. A position sheltered from strong winds is ideal, as the finely cut leaves dry out quickly in exposed spots.
Watering
Acers like evenly moist, well-drained soil, and they dislike both drought and waterlogging.
- Water thoroughly when the top few centimetres of soil feel dry, especially in warm weather.
- Container-grown trees need regular watering in spring and summer, as pots dry out quickly.
- Water less in autumn and winter, when the tree is dormant and needs far less moisture.
- Avoid letting the pot sit in water, as this can damage the roots.
Temperature and positioning
Acer palmatum 'Seiryu' is fully hardy in the UK and will happily stay outdoors all year round. New spring foliage can be vulnerable to late frosts, so if a frost is forecast, a layer of garden fleece overnight will offer peace of mind. A sheltered position away from cold, drying winds will keep the foliage looking its best.
Feeding
Feed in spring with a balanced, slow-release fertiliser, or a light ericaceous feed if your soil is on the alkaline side. Avoid overfeeding, as acers are light feeders and too much fertiliser can cause weak, leggy growth. No feeding is needed during autumn and winter.
Pruning
The Seiryu has a naturally graceful shape and needs very little pruning. Remove only dead, damaged or crossing branches in late winter or early spring, when the bare branches make it easy to see what you are doing. Avoid heavy pruning, which can spoil the tree's elegant outline, and never remove more than a small amount of growth at once.
If it's in a pot
The Seiryu is a lovely container plant. Choose a pot with good drainage holes that is only slightly larger than its current one, and use a free-draining, slightly acidic compost such as ericaceous mix. Keep an eye on watering in summer, and raise the pot onto feet in winter so excess rainwater can drain away freely.
Repotting
Repot in spring, every two to three years or when roots begin to appear at the drainage holes. Move the tree into a pot only slightly larger than before, tease out the outer roots gently, and refresh the compost each time. Acers are happy when slightly snug, so there is no need to rush into a much larger pot.
A little help if things go wrong
Crispy or scorched leaf edges: this is usually sun, wind or drought. Move the tree to a more sheltered position with dappled shade and check the watering routine.
Leaf scorch in summer: protect the tree from strong midday sun through glass or in exposed positions, and keep the soil evenly moist.
Wilting despite damp soil: the roots may be waterlogged. Let the soil drain fully and reduce watering until the surface begins to dry.
Green leaves but no autumn colour: ensure the tree receives a little morning sun, which helps develop the best autumn tints, and avoid overfeeding.
Enjoy your Japanese maple
Give your Acer palmatum 'Seiryu' a sheltered, lightly shaded spot, consistent moisture, and a little room to spread its elegant branches, and it will reward you with delicate foliage, graceful form, and a spectacular display of autumn colour year after year.