Japanese Maple

The most refined and elegant small ornamental tree, available in hundreds of cultivars with deeply dissected leaves in greens, reds, purples, and variegated patterns. Japanese maples prefer dappled shade protected from hot afternoon sun and wind, which can scorch their delicate foliage. They grow slowly into graceful, layered specimens that are perfect for Asian-inspired gardens, courtyards, and container growing. Provide moist, well-drained acidic soil and a thick mulch layer to protect their shallow root systems.

Japanese maple seeds form in paired winged samaras that ripen in fall. Collect samaras when they turn brown and dry on the tree. Remove the wing and soak seeds in water for 24 hours. Cold-stratify in moist peat at 35 to 40 degrees Fahrenheit for 90 to 120 days. Sow stratified seeds a quarter inch deep in moist, acidic seedling mix in spring. Germination occurs in 2 to 4 weeks at 65 to 70 degrees. Seedlings are highly variable from seed and will not replicate named cultivar characteristics. Grow seedlings in dappled shade with consistent moisture. Named cultivars are propagated by grafting onto species rootstock, typically performed by specialty nurseries.

The Season Plate

Your Japanese Maple Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Japanese Maple Mar – Apr, Oct – Nov, pick —. Set your climate below and every date on this plate re-times itself.

Sowing window

Mar – Apr, Oct – Nov

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around Mar 14

≈ 1825 days from sowing · 15-40 square per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Japanese Maple reminders watering, feeding and pruning, timed to your dates

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Frost alerts for your garden a warning before a cold night costs you the crop

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Succession sowing dates so the picking never gaps mid-season

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Get my Japanese Maple datesSaved to your free garden plan · no card needed

Japanese maple is considered by many to be the most beautiful small ornamental tree in the world, with hundreds of cultivars offering extraordinary diversity in leaf shape, color, size, and growth habit. Site selection is critical: choose a location with morning sun and afternoon shade or consistent dappled light. Hot afternoon sun and drying winds cause leaf scorch, the most common complaint about Japanese maples. Provide moist, well-drained, acidic soil with a pH of 5.5 to 6.5.

Plant container-grown specimens in spring or early fall. Japanese maples are shallow-rooted and resent deep planting. Set the root ball at grade level or slightly high. Dig the hole 2 to 3 times wider than the root ball. Backfill with native soil lightly amended with compost. Water deeply at planting and maintain consistent moisture throughout the growing season, especially during the first 3 years.

Mulch with 3 to 4 inches of organic matter such as pine bark or composted leaves, extending to the drip line. Never pile mulch against the trunk. Japanese maples rarely need pruning; their natural growth habit is their greatest asset. If thinning is desired, prune in late winter to reveal branch structure, or in mid-summer when sap flow is minimal. Japanese maples are excellent container subjects; use a well-draining mix and protect the pot from freezing in winter.

Japanese maples are the centerpiece of Japanese-inspired gardens and pair beautifully with other Asian garden plants. Underplant with hostas, Japanese forest grass (Hakonechloa), ferns, and astilbes for layered textural interest. Azaleas, rhododendrons, and pieris share the same soil and light preferences. Mosses create an authentic Japanese garden floor beneath maples. Spring bulbs like crocuses and miniature daffodils provide early color. Japanese iris, sedges, and ornamental grasses complement the maple's refined form near water features.

The Society Table

Pansy belongs beside it. Walnut Tree doesn't.

Old growers' knowledge, checked against Japanese Maple's real companion table below — test any plant you're growing.

Grows well in the company of · 2

PansyBegonia

Keep apart · 1

Walnut Tree

Plant Japanese Maple with good neighboursThe planner flags conflicts before they're in the ground

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Japanese maple requires moist, well-drained, acidic soil with a pH of 5.5 to 6.5 and high organic matter content. Heavy clay must be amended with compost, pine bark, and perlite to improve drainage. For container culture, use a quality potting mix with added pine bark for drainage and acidity. Fertilize lightly in early spring with an organic or slow-release acidifying fertilizer at half the recommended rate. Over-fertilization causes excessive growth that is vulnerable to winter damage and leaf burn. Do not fertilize after mid-summer. Mulch generously with organic matter to maintain soil moisture and acidity.

Ideal Temperature

Hardiness Zone Compatibility

Japanese maple is not grown for food harvest. Its value is entirely ornamental, though the seeds (samaras) are technically edible when boiled to remove tannins, as practiced historically in Japan during famines. The primary harvest from Japanese maples is aesthetic: the stunning fall foliage in shades of crimson, scarlet, gold, and orange is world-renowned. Branches with colorful fall leaves can be cut for indoor arrangements. In Japanese tradition, fallen autumn leaves are collected and pressed for art.

Storage & Preservation

Cut branches of Japanese maple with fall color last 5 to 7 days in water indoors. To preserve individual leaves, press them between sheets of wax paper with a warm iron, or place between sheets of absorbent paper inside heavy books for 2 to 3 weeks. Pressed leaves retain their color for months and are used in crafts, cards, and botanical art. Glycerin preservation, achieved by standing cut branches in a mixture of one part glycerin to two parts warm water for several weeks, produces supple, long-lasting foliage that retains natural color tones.

Verticillium Wilt

Disease

Sudden wilting and browning of leaves on individual branches, often on one side of the tree. Affected branches may show olive-brown streaking in the sapwood when cut. Can kill branches or entire trees.

Prevention Plant in well-drained soil not previously used for susceptible crops like tomatoes, potatoes, or strawberries. Keep trees vigorous with proper watering and mulching. Avoid soil compaction over roots.

Fix: No chemical cure. Prune out affected branches well below visible symptoms, sterilizing tools between cuts. Maintain tree vigor with proper watering and light fertilization. Some trees recover on their own.

Japanese Maple Scale

Pest

Tiny white to pale purple oval scales on branches and twigs. Heavy infestations cause twig dieback and reduced vigor. The tree may develop a sparse, thin canopy over time.

Prevention Inspect new plants carefully. Monitor branches regularly for early detection. Maintain tree vigor and encourage natural predators.

Fix: Apply dormant horticultural oil in late winter before buds swell. For active infestations, target the crawler stage in late May through June with insecticidal soap or systemic insecticide.

Anthracnose

Disease

Irregular brown or black spots on leaves, sometimes following leaf veins. Affected leaves may curl and drop prematurely. Most common during cool, wet spring weather.

Prevention Ensure good air circulation with adequate spacing. Water at the base rather than overhead. Rake and destroy fallen leaves to reduce fungal inoculum.

Fix: Fungicide applications are rarely necessary for established trees. Improve cultural conditions. Chlorothalonil sprays during wet springs can protect young or recently transplanted trees.

Troubleshooting Common Problems

Leaf scorch is the single most common problem, caused by hot afternoon sun, drying winds, reflected heat from pavement, or drought stress. Brown, crispy leaf margins develop in mid to late summer and are rarely fatal but are unsightly. Protect trees from afternoon sun and wind, maintain consistent moisture, and mulch heavily. Late spring frosts can damage emerging foliage, especially on early-leafing cultivars. Verticillium wilt can cause sudden branch death with no effective cure. Japanese maples planted too deep develop crown rot and decline. Container-grown specimens are vulnerable to root freeze in cold winters.

Growing Tips

1. Site selection is the single most important factor for Japanese maple success. Choose a location with morning sun and afternoon shade, protection from strong winds, and well-drained acidic to neutral soil with a pH of 5.5 to 6.5.
2. Avoid planting in heavy clay or poorly drained soil. If drainage is poor, plant on a raised mound or berm 15-20 cm above the surrounding grade to prevent root rot and ensure proper water movement away from the root crown.
3. Water deeply and consistently, especially during the first three years of establishment. Japanese maples have shallow, fibrous root systems that dry out quickly. Apply 2.5-4 cm of water weekly during the growing season when rainfall is insufficient.
4. Mulch is essential. Apply 5-8 cm of organic mulch such as shredded bark, leaf mold, or pine needles in a ring extending to the drip line. Keep mulch at least 10 cm away from the trunk to prevent moisture buildup and bark decay.
5. Prune only during full dormancy in late winter, ideally in February before sap begins to flow. Japanese maples bleed sap heavily if pruned during active growth, which weakens the tree and creates entry points for fungal pathogens.
6. Protect young trees from late spring frosts by covering with lightweight frost cloth when nighttime temperatures are forecast to drop below minus 2°C. Emerging leaves are extremely frost-sensitive and cannot recover once damaged.
7. Fertilize sparingly with a slow-release organic fertilizer formulated for acid-loving plants. Apply once in early spring at half the recommended rate. Over-fertilizing causes leggy growth, poor fall color, and increased susceptibility to pests.
8. When growing in containers, use a well-draining acidic potting mix and repot every 2-3 years in late winter. Container-grown trees need more frequent watering and winter protection, as roots are more exposed to freezing temperatures.
9. If leaf scorch appears as brown, crispy leaf margins during summer, increase watering frequency and consider adding shade protection. Leaf scorch indicates the roots cannot supply water as fast as the foliage is losing it through transpiration.
10. Monitor for verticillium wilt, the most serious disease of Japanese maples. Symptoms include sudden wilting and dieback of individual branches. There is no cure, but maintaining tree vigor through proper watering and nutrition helps the tree compartmentalize the infection and survive.