Juglans regia

Main Bloom Time: Early spring, Late spring, Mid spring. Form: Rounded.

Juglans regia is a deciduous Tree growing to 20 m by 20 m at a medium rate.
It is hardy to zone 5 and is not frost tender. It is in flower in June, and the seeds ripen in October. The species is monoecious and is pollinated by Wind. The plant is self-fertile.
Suitable for: light , medium and heavy soils and prefers well-drained soil. Suitable pH: acid, neutral and basic soils. It cannot grow in the shade. It prefers moist soil.

Global Crop Management: Standard Other Systems: Irreg. Intercrop Other Systems: Strip intercrop Staple Crop: Protein-oil
Landscape Uses:Aggressive surface roots possible, Specimen. Requires a deep well-drained loam and a sunny position sheltered from strong winds. Prefers a slightly alkaline heavy loam but succeeds in most soils. The walnut tree is reported to tolerate an annual precipitation of 31 to 147cm, an annual temperature in the range of 7.0 to 21.1°C and a pH in the range of 4.5 to 8.2. The dormant plant is very cold tolerant, tolerating temperatures down to about -27°C without serious damage, but the young spring growth is rather tender and can be damaged by late frosts. Some late-leafing cultivars have been developed, these often avoid damage from spring frosts and can produce a better quality timber tree. The walnut tree is frequently cultivated for its edible seed in temperate zones of the world, there are many named varieties. Newer cultivars begin producing nuts in 5 - 6 years;by 7 - 8 years, they produce about 2.5 tons of nuts per hectare. Orchards on relatively poor, unirrigated mountain soil report 1.5 - 2.25 tonnes per hectare, orchards in well cultivated valleys, 6.5 - 7.5 tonnes per hectare. According to the Wealth of India, a fully grown individual can yield about 185 kg, but 37 kg is more likely. Trees grow well in most areas of Britain but they often fail to fully ripen their fruits or their wood in our cooler and damper climate, they prefer a more continental climate. There are some very fine trees in Cornwall. Walnuts can produce large healthy trees in many parts of Britain, but seedling trees often do not fruit reliably. Some European varieties have been developed that succeed in colder areas. Seedling trees are said to take from 6 to 15 years to come into fruit from seed, but these cultivars usually start cropping within 5 years. Plants produce a deep taproot and they are intolerant of root disturbance. Seedlings should be planted out into their permanent positions as soon as possible and given some protection for their first winter or two since they are somewhat tender when young. Flower initiation depends upon suitable conditions in the previous summer. The flowers and young growths can be destroyed by even short periods down to -2°c, but fortunately plants are usually late coming into leaf. Some cultivars are self-fertile, though it is generally best to grow at least two different cultivars to assist in cross-pollination. Any pruning should only be carried out in late summer to early autumn or when the plant is fully dormant otherwise wounds will bleed profusely and this will severely weaken the tree. Plants produce chemicals which can inhibit the growth of other plants. These chemicals are dissolved out of the leaves when it rains and are washed down to the ground below, reducing the growth of plants under the tree. The roots also produce substances that are toxic to many plant species, especially apples , members of the Ericaceae, Potentilla spp and the white pines . Trees have a dense canopy which tends to reduce plant growth below them. All in all, not the best of companion trees, it is also suggested that the trees do not like growing together in clumps. Trees are said to inhibit the growth of potatoes and tomatoes. Hybridizes with J. nigra. This species is notably susceptible to honey fungus. The bruised leaves have a pleasant sweet though resinous smell. Special Features:
Not North American native, Inconspicuous flowers or blooms. The plant is heat tolerant in zones 7 through 1. .
At this temperature, many plants begin to suffer physiological damage. Heat Zones range from 1 to 12 .
For example Heat Zone. 11-1 indicates that the plant is heat tolerant in zones 11 through 1.) For polyculture design as well as the above-ground architecture information on the habit and root pattern is also useful and given here if available. The plant growth habit is a standard with a non-suckering single trunk .