Acer palmatum 'Emerald Lace' (Японски клен)

Acer palmatum 'Emerald Lace', also known as the "Japanese maple Emerald Lace," is a cultivar of the species Acer palmatum from the Sapindaceae family. This deciduous shrub is notable for its finely cut, deeply lobed foliage of a vibrant emerald green, and for its spectacular autumn colors. Native to Japan, 'Emerald Lace' is an excellent choice for ornamental gardens, Japanese-style landscapes, and bonsai, due to its delicate texture, compact stature, and graceful appearance.

Appearance of leaves, flowers, and fruits

• Leaves: The leaves are deeply palmate, with 5-7 very thin and finely dissected lobes, lace-like, of a bright emerald green in spring and summer. Their airy texture and serrated edges create a delicate visual effect. In autumn, the leaves turn into intense shades of bright red, purple, and orange, offering a dramatic colorful display. The leaves are small, 4-6 cm, emphasizing the plant’s fine appearance.
• Flowers: The flowers are small, purple, grouped in discreet clusters, appearing in April-May. They are not ornamentally significant but attract pollinators such as bees.
• Fruits: The fruits are paired samaras, initially reddish, turning brown at maturity, 1-2 cm long. They appear in summer but do not significantly contribute to the plant’s aesthetic.

Growth characteristics

• Height and width: It grows as a compact shrub, reaching 2-3 meters in height and 2-3 meters in width, with a rounded, slightly arching crown, and a weeping habit. Its slow growth makes it ideal for small gardens.
• Vigor: It has slow growth, with fine and flexible branches that enhance its delicate appearance.
• Type: It is a deciduous shrub with fine branching that highlights the textured foliage.

Growing conditions

• Exposure: Prefers partial shade or filtered sunlight, ideally under trees with sparse crowns or near an east-facing wall. Full sun can scorch the fine leaves, especially in warm climates, while dense shade reduces the intensity of autumn colors.
• Soil: Requires fertile, well-drained soil, with a slightly acidic to neutral pH (5.5-7). A mix of garden soil, compost, and peat is ideal. It does not tolerate waterlogged or chalky soils.
• Watering: Needs regular watering, keeping the soil consistently moist but not waterlogged. A layer of organic mulch (e.g., bark) helps retain moisture.
• Pollination: The flowers attract pollinators, but the fruits are not relevant for ornamental value.

Care and resistance

• Hardiness: It is hardy to temperatures down to -20°C (zones 5-8), suitable for temperate climates, including Romania. Young leaves can be affected by late frosts, and fine branches require protection during harsh winters.
• Fertilizing: 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. Heavy pruning can disrupt the natural delicate appearance.
• 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.
• Wildlife: Flowers attract bees, and the samaras may be eaten by small birds.

Uses

Acer palmatum 'Emerald Lace' is ideal for Japanese gardens, cottage-style landscapes, or as a solitary plant in small gardens. Its lacy foliage pairs beautifully with plants such as hosta, ferns, or azaleas, creating textured contrasts. It can be grown in containers on terraces but requires protection from wind and cold. It is perfect for adding elegance and liveliness to ornamental landscapes.

Origin

Acer palmatum is native to Japan, Korea, and China, where it grows in temperate forests. The 'Emerald Lace' cultivar was selected for its deeply dissected foliage and vibrant seasonal colors, being a relatively recent variety in ornamental horticulture. Its name reflects the emerald green color of the leaves and their lace-like texture.

Possibility of turning Acer palmatum 'Emerald Lace' into bonsai

Acer palmatum 'Emerald Lace' is an excellent choice for bonsai due to its small, deeply lobed leaves, spectacular seasonal colors, and slow growth, which facilitate shaping and maintenance.

Height with pot included approx. 30 cm