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Acer palmatum Marlo - Japanese Maple

Acer palmatum Marlo
Japanese Maple, Palmate Maple

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This plant carries a 24 months recovery warranty

More information

A delightful and unique variety. Its green leaves are edged with pink in spring and turn red in autumn. Its growth is slow and it does not exceed 2m (7ft) at maturity. It is sensitive to sunlight and should be planted in partial shade, or even in full shade. Moreover, it is highly susceptible to powdery mildew, making it a delicate plant suitable only for experienced gardeners.
Height at maturity
1.50 m
Spread at maturity
1.50 m
Exposure
Partial shade, Shade
Hardiness
Hardy down to -23°C
Soil moisture
Moist soil
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Best planting time February, October to November
Recommended planting time September to November
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Description

Acer palmatum 'Marlo' is a variety of Japanese maple selected in Holland for its remarkable foliage. Its deeply cut leaves are edged in pink in spring. This border fades as the leaf matures, but the young shoots produced in summer retain this pink pigmentation, which stands out against the rest of the now green foliage. In autumn, the leaves eventually turn a beautiful red. Slow-growing, this Japanese maple reaches 1.5m (5ft) in 10 years. Magnificent but very susceptible to powdery mildew, it is a plant for connoisseurs.

 

 

Native to eastern China, Korea, and Japan, Acer palmatum is the origin of a multitude of horticultural varieties that compete in beauty. Japanese maple now belongs, like all maples, to the Sapindaceae family (formerly Aceraceae). It is hardy, but cannot tolerate dry and cold winds, scorching exposure, and dry and chalky soils.


The cultivar 'Marlo' exhibits exceptional foliage colours. One of the first Japanese maples to bud in spring, it produces beautiful palmate leaves with deeply cut lobes - almost to the base - irregularly toothed and more or less undulate laterally. This beautiful aesthetic is enhanced by an additional attraction, as a bright pink margin contrasts with the green of the central part of the lobes. This colour fades in summer, with the leaf becoming entirely green, but the young shoots produced during the growing season proudly display this original pink pigment. Finally, in autumn, the entire foliage takes on a magnificent red colour.


This variety has a rather slow growth rate and limited development. With a height of 1.5m (5ft) at 10 years and an equivalent width, it does not exceed 2m (7ft) at maturity. This makes it suitable for small gardens as well as container cultivation.

 

Acer palmatum 'Marlo' is not strictly speaking an acidic-soil plant, but it prefers humus-rich and moisture-retaining soils. However, the soil should be well-draining to avoid compromising its survival, as it is a rather delicate plant. It cannot tolerate atmospheric drought and must be protected from wind and full sun, which would scorch its delicate leaves. Above all, it is very susceptible to powdery mildew, which attacks its foliage, deforming it and covering it with a characteristic white fuzz. In spring, it can also be targeted by aphids. It needs a great deal of care so it should not be the first Japanese maple to try in the garden; it is not a plant for beginners!


Enthusiasts will appreciate the aesthetic potential of this small maple by planting it with other plants with fine or laciniate foliage. The bleeding heart 'Stuart Boothman' with its delicate greyish foliage will share the same soil and exposure requirements. Other low-growing plants, such as the golden summer heather, will create a nice colour contrast with the foliage of our little 'Marlo' maple. In the background, a purple birch will provide the shade it needs while highlighting its fine foliage against a dark background.



Acer palmatum Marlo - Japanese Maple in pictures

Acer palmatum Marlo - Japanese Maple (Foliage) Foliage

Plant habit

Height at maturity 1.50 m
Spread at maturity 1.50 m
Habit Irregular, bushy
Growth rate slow

Flowering

Flower colour insignificant

Foliage

Foliage persistence Deciduous
Foliage colour green

Botanical data

Genus

Acer

Species

palmatum

Cultivar

Marlo

Family

Sapindaceae

Other common names

Japanese Maple, Palmate Maple

Origin

Cultivar or hybrid

Product reference1003341

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Planting and care

Plant in spring or autumn in preferably light, humus-rich, neutral to acidic, deep, loose and well-drained soil. It is best suited for a semi-shaded or even shaded position, as it does not tolerate full sun. It should also be protected from cold and dry winds that may dry out its magnificent foliage. The soil should be kept moist by mulching in summer, if necessary, but it should also be well-drained to avoid weakening the roots.

In the case of planting in a container, use a slightly acidic substrate (pH 6) mixed with a little compost. Water regularly, especially in summer, choose a shaded exposure, especially for the afternoon, and sheltered from the wind. Never forget that growing conditions in containers are drier than in open ground.

Monitor the appearance of scale insects or aphids that may launch attacks in spring, and get rid of them by treating with black soap. As for diseases, be careful of Verticillium in open ground, a fungal disease that occurs in heavy and wet soil (less of a risk in containers).

Powdery mildew is a declared enemy of this delicate variety.

Planting period

Best planting time February, October to November
Recommended planting time September to November

Intended location

Suitable for Woodland edge, Undergrowth
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Experienced
Exposure Partial shade, Shade
Soil pH Acidic, Neutral
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil

Care

Pruning No pruning necessary
Soil moisture Moist soil
Disease resistance Poor
Overwinter Can be left in the ground

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