The olive tree, Olea europaea, is a subtropical evergreen tree from the Oleaceae family that is native to the Mediterranean, Africa and China. They grow best in areas with a Mediterranean climate, which is characterised by a long, hot, dry summer growing season and a […]
Woolly aphids are sap-sucking pests that are bluish-black in colour that produce a covering of fluffy white wax that resembles wool. They can be found clustered around the bases of new shoots on branches, wounds on trunks and branches, and on exposed roots of apple […]
The practice of painting tree trunks white to protect them, which is known as whitewashing, has a long history that can be traced back to ancient times. The use of lime-based whitewash dates back to ancient Greece and Rome and gained popularity during the medieval […]
Edible figs (Ficus carica) belong to the Moraceae (mulberry) family, and the genus Ficus is one of the largest of the angiosperms (flowering plants) with over 800 species, characterised by their milky latex and their uniquely structure of its fruit, known as figs, which are actually inverted flowers, with hundreds of […]
Citruses are flowering trees and shrubs from the rue (Rutaceae) family and are native to subtropical and tropical regions of South Asia, East Asia, Southeast Asia, Melanesia, and northeastern Australia. Plants in the genus Citrus provide a wide assortment of fruit types, including important crops […]
The life expectancy of fruit trees varies with the type of fruit tree, and the rootstock that they’re grafted onto (if they’re not growing on their own roots). Trees on dwarf rootstock tend to have a shorter life span than their larger counterparts because the […]
Burr knots (burrs or burls) are masses of small root initials, plant cells that are dividing and transforming into root tips, which appears on the above-ground portion of a rootstock, or on the trunk and limbs of apple trees. This is an inherited disorder where […]
Bananas are tropical plants that belong to the Musaceae (plantain and banana) family. The cultivated varieties of bananas available today originate from ancestral species native to the Malaysian peninsula, New Guinea and South-East Asia. Even though banana plants are mistakenly referred to as trees, they’re […]
The recommended time for planting all evergreen trees and plants, including citrus, is in spring, and the next best time to plant them is in early autumn. The question many new gardeners ask is why? Evergreen trees and plants retain their leaves all year round. […]
The feijoa (Acca sellowiana), commonly known as pineapple guava, is an evergreen fruiting shrub or small tree from the Myrtaceae family, that is native to South America. It is widely grown in the subtropics and in warm temperate areas. This remarkably hardy plant is quite […]
Is the advice to “use potash and Epsom salts to grow sweeter citrus fruit” based on scientific fact, or is it just gardening folklore? Adding potash (potassium) is only helpful when citrus trees are suffering from potassium deficiency, which is rare in healthy soils, and […]
High density tree planting, where two or more trees can be planted in the same hole to form a single canopy with multiple trunks, is drawn from the system of Backyard Orchard Culture, developed by the Dave Wilson Nursery of Central California. In this system, […]
Osage orange (Maclura pomifera), also known as Bois d’ arc, Hedge Apple or Horse Apple, is a member of the Moraceae family, to which figs, mulberries, breadfruit and jackfruit also belong, and is native to the south-central United States. This thorny, fast-growing, medium-sized tree or […]
When leaves of a citrus tree curl evenly along their length, this is a protective response to minimises leaf surface area in order to reduce moisture loss. It indicates that the roots of the tree can’t supply enough water to support the leaves. This form […]
Tightly curled, yellowing, distorted, and diseased-looking young leaves at the tips of the branches on stone fruit in spring, mainly on cherry and plum trees, is a sign of damage caused by aphids. What are Aphids? Aphids are small sap-sucking pests insects around 2-4 mm […]
Fruit trees flower and fruit each year, but some of them do so only on new branches, or specific parts of older branches. Why does this matter? If we prune off the wrong branches, we might lose our whole fruit crop for a year! By […]
Citrus vein enation (CVEV), also known as woody gall, is a viral disease which affects various lemon and lime trees and citrus rootstocks. This disease is caused by the CVE virus, a luteovirus which is transmitted by aphids, including the black citrus aphid (Toxoptera citricidus), […]
There tends to be some confusion about Nightingale and Hachiya persimmons. Despite what some claim, they are not the same thing, they’re two different varieties of Oriental persimmon, Diospyrus kaki, which look fairly similar in appearance. Both of these are astringent varieties, they can only […]
Nutrient imbalances and deficiencies can adversely affect the quality of citrus fruit. Excess nitrogen combined with low phosphorus will cause citrus fruit to be misshapen, with thick peel, a coarse and roughly textured rind, coarse pulpy flesh without much juice, and an open centre. The […]
Queensland fruit fly or Qfly (Bactrocera tryoni) is one of the most damaging pests of fruit and vegetables in Australia. This insect is native to eastern Queensland and north-eastern New South Wales, but has extended its range due to transport of infected fruit, the planting […]
Fruit trees are trained into particular shapes to make them more productive, easier to manage and better able to support heavy crop loads. Formative pruning (also referred to as framework pruning) is carried out in the first three years of planting a young tree to […]
Fruit trees are trained into particular shapes to make them more productive, easier to manage and better able to support heavy crop loads. Formative pruning (also referred to as framework pruning) is carried out in the first three years of planting a young tree to […]
Most fruit trees are pruned the same way, making winter pruning a fairly straightforward task, but there are a few exceptions. With some fruit trees, the ends of their branches shouldn’t be cut off, otherwise they won’t fruit, because they either fruit from the ends […]
Fruit tree pruning is both an art and a science. The art to fruit tree pruning is not something that can be taught in a short article or video, but basic pruning technique is quite easy to understand, and once grasped, almost anyone can maintain […]
The first step in pruning a tree, before making and cuts to change the shape or size of a tree, is to remove any dead, diseased or broken branches. If removing a branch completely, it’s important to make the cut correctly so as to not […]
“He who plants a tree plants a hope.” -Lucy Larcom Planting a fruit tree is truly an investment in the future, it may take a year or three before a tree begins to bear fruit, but most fruit trees can be productive for 20 to […]
Is your citrus tree dropping its fruit before they reach full size, or even worse, dropping the flowers before fruit even begin to form? This problem can happen to oranges, lemons, lime, grapefruit, mandarins and all other citrus. Trees photosynthesise to produce carbohydrates such as […]
Sun scald is not a disease, but damage caused to apples and many other fruit, caused by high temperatures and strong sunlight in summer. Typically, sun scald damage appear on sun-exposed side, which is usually towards the direction of the midday to afternoon sun. The […]
If leaves are yellowing on a citrus tree, it may be a sign of nutrient deficiency, but it may not be, depending on which leaves are yellowing. Older leaves yellowing are quite normal as long as it’s only happening to a very small number of […]
Why do apparently healthy looking citrus trees suddenly start deteriorating in a matter of days, with leaves curling then dropping, branches dying back, eventually resulting in the loss of the tree? There are several causes, often caused by common gardening mistakes, which are easy to […]
Glue-banding of tree trunks is an effective technique for controlling various pests of fruit trees. A waterproof band covered in horticultural glue, an aggressive long-lasting adhesive, is wrapped around the trunk of the tree to create a sticky barrier which prevents climbing insects from making […]
Crown gall is a bacterial disease caused by Agrobacterium tumefaciens (syn. Rhizobium radiobacter), which produces tumour-like swellings on the bark of trees and plants. It can infect a wide range of dicotyledonous (broad-leaved) plants, particularly members of the Rosaceae (rose) family such as roses, raspberries, […]
Various cultivars of Navel and Valencia oranges, mandarins and mandarin hybrids are prone to fruit splitting, a pre-harvest physiological rind disorder. Gardeners often wonder if this phenomenon is caused by a nutrient deficiency. Actually, there’s another cause, but plant nutrition can play a part in […]
Apple tree branches covered in patches of white, woolly fuzz? What you’re seeing is a woolly aphid infestation. These pests can be controlled by spraying a few applications of horticultural oil spray (preferably a natural oil-based product rather than a petroleum oil based one) 7 […]
One of the most common nutrient deficiencies seen on citrus is the yellowing of the leaf with dark green veins. Citrus are heavy feeders and are prone to nutrient deficiencies in autumn when they’re fruiting heavily and maturing their fruit, and magnesium deficiency is a […]
Are your citrus leaves turning green with yellow veins in winter? When gardeners see this colour change in their citrus leaves, they often wonder if this is due to a nutrient deficiency, and if so, what they can do to fix it. Leaf Chlorosis The […]
What are Citrus Galls? Citrus galls are unsightly swellings caused by a tiny female citrus gall wasp (Bruchophagus fellis) which lays her eggs in the soft new growth of citrus trees in spring. As the new growth hardens off, a woody gall forms around the […]
Natural pest control techniques such as companion planting can control most of your small garden pests such as insects, but what can gardeners do about birds and animals? The seasonal event of birds and other critters stripping fruit trees clean is nothing new for farmers, […]
Fruit trees naturally reproduce themselves from seeds, but most fruit trees that you buy are not produced that way for very good reasons. There are many ways to propagate fruit trees, and each method has its advantages and disadvantages. Whether you propagate fruit trees yourself […]
If you thought that hedges and hedging were restricted to ornamental gardening only, you’d be seriously mistaken! Hedges are quite useful in a garden, and can serve many functions, such as: barriers for security, privacy and screening purposes shade for people or gardens – especially […]
This article is an introduction to the gardening technique of Backyard Orchard Culture – a system of high density planting of fruit trees which allows for a wide variety of fruit to be grown in a limited space, and harvested over a prolonged period of […]
What is an Espalier? An espalier (pronounced “es-PAL-yer”) is a tree that has been trained to grow in a flat plane against a wall,fence, or trellis, though the term has also been used to describe the technique of training a tree to grow this way. […]
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