Japanese maple "Jordan" 1.50 - 1.70 m / Acer shirasawanum "Jordan" /

The genus Acer

Acer palmatum group

Acer palmatum (Japanese Maple) is a small deciduous shrub/tree, native to Asia and very popular in Japan where, along with Japanese cherry blossoms and pines, it is the main attraction in all parks and gardens. Japanese maples have a very harmonious form, elegant leaves that create attractive, colorful symphonies that change with the seasons. In the spring, small, reddish-purple flowers appear, with yellow stamens grouped in hanging bunches, which then turn into red and brown winged fruits when ripe. Fast growth in young plants, then slower. The plants are resistant to cold, but do not tolerate late frost and cold air currents, especially when they are young. They need cool, light, moist but well-drained, slightly acidic and clay soil. It also grows well in other types of soil as long as it is not very compact, stagnant or calcareous, requiring the administration of an acid supplement. The exposure of the plant must be in partial shade or in a sunny position, but it requires better irrigation. Partial shade is absolutely necessary if the soil is sandy or very light, in hot or dry areas.

Acer shirasawanum "Jordan" (Japanese maple "Jordan") is a Japanese maple with a habit in the form of a bush with a round crown and young branches covered with blue inflorescences. The leaves are 6-8 cm, with 9-13 lobes and red petioles. Throughout spring, the color is ocher yellow, then green-yellow until autumn, when they start to take on shades of orange and purple.

Maximum height: 2.5 – 4.5 m

Maximum width: 2.5 m

Zone 6 -23.3°C / -17.8°C (minimum temperature resistance).

Growth: moderate.

Location: sun, semi-shade.

Resistance zones for plants in Europe:

Average annual minimum temperatures in °C*

Zone 1 < -45.5°C

Zone 2 -45.5°C / -40.1°C

Zone 3 -40.0°C / -34.5°C

Zone 4 -34.4°C / -28.9°C

Zone 5 -28.8°C / -23.4°C

Zone 6 -23.3°C / -17.8°C

Zone 7 -17.7°C / -12.3°C

Zone 8 -12.2°C / -6.7°C

Zone 9 -6.6°C / -1.2°C

Zone 10 -1.1°C / +4.4°C

Zone 11 > +4.4°C

* Minimum temperatures are an important factor that determines plant resistance (the ability of plants to survive in places where these minimum temperatures can occur).

This principle was created in the early 1960s by the "Department of Agriculture in the United States of America" ​​and was then adapted for Europe by W. Heinz and D. Schreiber.

Based on this principle, Europe was divided into 11 zones.