Data Sheet for Walnut for the English or white Walnut
a) Walnut trees can live up to 150 years
b) The new varieties introduced could bear fruit in their first year. It will be 4–6 years to produce a harvestable quantity and 10–12 years for the tree to reach full production
c) Walnuts are ready for harvest in autumn – specific timing will be influenced by location and variety. The nuts can mature on the tree over a few weeks.
d) Will keep producing nuts as long as its healthy and can be pollinated
e) The English White walnut originated in Iran
f) Walnut is a deciduous tree that requires distinct cold and warm seasons. It grows best in a temperate climate, with about 600–800 hours of chilling below 7°C each year and maximum temperatures that do not exceed about 38°C. The ideal pH is near neutral (5.5-7.5). good production can be achieved on annual rainfall of 1,000mm, however back-up irrigation is advisable to ensure the tree has water at the critical development and production stages.
g) Juglans Regia.
h) Trees are cultivated worldwide for their nuts and their high-quality timber, which is widely used in furniture, car interiors, doors (Both the white and black walnut is valued for its timber. The black is more prized for its timber) Walnuts may also be pressed to extract oil, which is generally used in salad dressings. It is also possible to produce walnut milk by blending the nuts with water at high speed.
i) Hieght 25 meters with a spreading canopy of 10 – 15meters
j) Local cockatoos can be a problem as Phytophthora root rot and Powdery mildew are also common walnut tree diseases. Every walnut tree has both male and female flower parts. Pollen is transferred by wind from male to female flower parts. All walnut varieties are self-fertile, meaning that the pollen can travel from the male parts to the female parts of the same tree and under this procedure the tree can produce nuts. Thus, a single tree can theoretically produce nuts without needing other walnut trees around. However, in most cases, pollen that is transferred through the wind to the female parts of the same tree (stigma) is often lost, because at that time the female flower is not receptive. Consequently, the best way to ensure adequate pollination in order to achieve the highest possible fruit set and yield is to ensure cross pollination by planting two or more varieties. Planting a walnut variety that produces pollen early, along with another variety that produces pollen later will ensure that adequate pollen will travel throughout the wind to female flowers of both varieties during the period of their receptivity. Walnut trees produce chemicals that are toxic to many plants (tomato, potato, alfalfa, blueberry, apple and many more).