Acer palmatum 'Seiryu'

Acer palmatum 'Seiryu' , also known as the 'Seiryu Japanese Maple', is a unique cultivar of the species Acer palmatum in the Sapindaceae family. This deciduous shrub is the only dissected Japanese maple with an upright habit, and is prized for its fine, lace-like foliage and spectacular seasonal colors. It is ideal for ornamental gardens, Japanese landscapes, and bonsai, due to its delicate texture and elegant form.

Appearance of leaves, flowers and fruits

• Leaves : The leaves are deeply dissected, with 7-9 thin, lace-like lobes, a bright light green in spring and summer. In autumn, the leaves turn vibrant shades of golden yellow, orange and bright red , creating a dramatic visual effect. The leaves are small, 4-6 cm, with finely serrated edges, giving an airy and textured appearance.
• Flowers : The flowers are small, purple, grouped in discrete clusters, appearing in April-May . They are ornamentally insignificant, but attract pollinators such as bees.
• Fruits : The fruits are double samaras, initially reddish, turning brown at maturity, 1-2 cm long. They appear in summer, but do not contribute significantly to the aesthetics of the plant.

Growth characteristics

• Height and width : It grows as an upright shrub, reaching 3-5 meters tall and 2-3 meters wide , with a rounded, open crown. Its moderate growth makes it suitable for medium gardens.
• Vigor : It has slow to moderate growth, with fine but robust branches, and a distinct upright habit.
• Type : It is a deciduous shrub, with fine branching that highlights the dissected foliage.

Growing conditions

• Exposure : Prefers partial shade or filtered sun , ideally under sparsely-crowning trees or near an east-facing wall. Full sun can burn the delicate leaves, and dense shade reduces the intensity of the colors in autumn.
• Soil : Requires fertile, well-drained soil with a slightly acidic to neutral pH (5.5-7). A mixture of garden soil, compost and peat is ideal. Does not tolerate waterlogged or chalky soils.
• Watering : Needs regular watering, keeping the soil consistently moist but not flooded. A layer of organic mulch (e.g. bark) helps retain moisture.
• Pollination : Flowers attract pollinators, but fruits are not relevant for ornamental value.

Care and resistance

• Hardiness : It is hardy to -20°C (zones 5-8), making it suitable for temperate climates, including Romania. Young leaves may be affected by late frosts, and branches require protection in harsh winters.
• Fertilization : Apply a balanced fertilizer (e.g. 10-10-10) in early spring to stimulate growth. Avoid excess nitrogen, which can affect seasonal colors.
• Pruning : Prune minimally in January-February to remove dead or crossing branches and maintain shape. Severe pruning can disrupt the upright habit.
• Pests and diseases : May be affected by mites, aphids or verticillium wilt. The fine leaves are sensitive to sunburn or strong winds. Good ventilation and drainage prevent problems.
• Fauna : The flowers attract bees, and the berries can be eaten by small birds.

Use

Acer palmatum 'Seiryu' is ideal for Japanese gardens , cottage gardens or as a solitary plant in medium gardens. The dissected foliage combines beautifully with plants such as hostas, ferns or azaleas, creating textural contrasts. It can be grown in containers on patios, but requires protection from wind and cold. It is perfect for adding height and dynamism to ornamental landscapes.

Origin

Acer palmatum is native to Japan, Korea, and China , where it grows in temperate forests. The cultivar 'Seiryu' was selected in Japan for its dissected foliage and unique upright habit, making it one of the most distinctive varieties of Japanese maple.

The possibility of turning Acer palmatum 'Seiryu' into bonsai

Acer palmatum 'Seiryu' is an excellent choice for bonsai due to its small, deeply dissected leaves, vibrant seasonal colors, and moderate growth that makes it easy to shape.

Height with pot included approx. 30 cm