Acer Palmatum 'Polymorphum' 80cm Pot 230cm Height Outdoor Tree

Acer palmatum ‘Polymorphum’ is often considered the classic green-leaved Japanese maple, and is actually an older traditional name sometimes applied to seedling forms of Acer palmatum with green foliage (essentially the typical species type). It remains a favourite for its elegant shape, reliable growth, and stunning seasonal transformation.

🌿 Key Features:

• Foliage: Broad, five- to seven-lobed palmate leaves emerge a fresh, bright green in spring, staying vibrant through summer. In autumn, they transform into a spectacular mix of gold, orange, and scarlet-red, often with multiple colours on the same tree.

• Habit: Develops into a graceful, small tree or large shrub with an upright, spreading habit. Typically reaches 4–6 metres high with a similar spread over many years, forming a rounded crown that creates light shade beneath.

• Bark: Smooth grey branches add gentle winter interest once the leaves fall.

Because of its clean, simple green foliage and outstanding autumn colour, ‘Polymorphum’ is perfect for adding a tranquil yet dramatic element to gardens, whether in lawns, woodland edges, or Japanese-inspired schemes.

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🌱 Detailed Care Guide for Acer palmatum ‘Polymorphum’

📍 Position & Light

• Prefers partial shade or dappled sunlight.

• Tolerates some morning or early afternoon sun, which can enrich autumn colour, but avoid hot, exposed afternoon sun to prevent leaf scorch.

• Plant in a sheltered spot, away from cold, drying winds.

🌬️ Shelter

• Important to avoid exposed sites. Strong winds can dry or damage delicate leaf margins, causing browning.

💧 Watering

• Likes soil to be consistently moist but well-drained.

• Water thoroughly during dry spells, especially when newly planted or if grown in containers.

• Mulch in spring with bark or compost to conserve moisture and keep roots cool.

🪴 Soil

• Prefers slightly acidic to neutral, fertile, humus-rich soil.

• Avoid very alkaline or heavy clay soils. If needed, plant in raised beds or containers using ericaceous compost with added grit for drainage.

🍽️ Feeding

• Feed lightly in spring with a balanced slow-release fertiliser or an acer-specific feed.

• Avoid high-nitrogen fertilisers which encourage lush growth prone to wind and frost damage.

✂️ Pruning & Maintenance

• Requires minimal pruning.

• Remove any dead, damaged or crossing branches in late autumn or winter while dormant.

• Avoid hard cutting back, which can ruin its graceful, natural shape.

🪲 Pests & Problems

• Generally very healthy and low-maintenance.

• May occasionally see aphids on soft new shoots.

• Leaf scorch (browned edges or tips) is usually caused by drought, strong wind or intense sun, not disease.

🚰 Container Growing

• Works well in large pots, especially if garden soil is unsuitable.

• Use ericaceous compost mixed with grit, ensure pots have good drainage, and raise on feet.

• Water regularly, and protect container roots in harsh winters by wrapping or moving to a sheltered spot.