Olive Trees: Olea europaea
The Olive tree is a truly beautiful, architectural tree widely loved by landscapers and homeowners throughout the world. This iconic Mediterranean plant is one of the most commonly grown fruit trees, when mature they can provide the homeowner with as much as 18kg (40lbs) of fruit each year!
Long living and easy to grow, it is a highly desirable feature tree. Not only for its fruiting ability but also for its evergreen, silvery foliage and gnarled, twisted trunks. The Olive tree becomes more beautiful with age and older specimens take on a truly ancient appearance. It can be grown in the ground as a feature tree within your planting scheme, it also makes wonderful hedging and is very useful as an ornamental windbreak. In pots and containers, it looks fantastic when clipped into a topiary specimen.
Drought tolerant, pest and disease free, and hardy throughout Australia, it can survive the hottest of summers and all but the coldest of winters with minimal care and maintenance. They are extremely resilient trees that are tough enough to withstand neglect even in containers.
One of the amazing things about Olive trees is that the more they mature the more interesting they become and here at Designer Trees we have a wide range to choose from. We have large, older specimens that make the most unusual and visually stunning feature trees; naturally spreading specimens that would make great hedging or shelter trees; and formally clipped topiary specimens that are just perfect for pots and patios.
Whatever shape or size of tree you are looking for you are sure to find it here and we are always apply to help you out with your selection.
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Olive Trees: Planting
The Olive tree requires a planting position that is in full sun but also sheltered from cold winds. Planting next to a sunny wall is ideal in cold prone areas as the heat retained by the wall will help to protect the plant against light frosts.
They are best planted in autumn but can be planted year round. A deep, fertile, well-drained soil is important. Loam is considered to be the best soil and a pH of 6.5 – 7.5 is ideal.
When planting Olive trees, the sub-soil is considered to be the most important factor in achieving healthy growth and high productivity. When planting into the ground, dig out the hole and then incorporate a well-rotted manure or compost into the sub-soil with a fork. This will encourage the tree to grow deep and become well rooted. Sand or gravel can be added to heavy soils to improve drainage.
In a container, plant the tree into a loam based potting mix with sharp sand or gravel incorporated to aid drainage. It is important that the container is raised slightly off the ground so that any excess water can drain freely from the holes at the base of the pot. The Olive tree does not like to have its roots sat in water.
Whether in the ground or a container it is recommended that your new tree should be planted at a slightly lower level than it was in its original pot. Do ensure that if you buy a specimen that has been grafted onto a rootstock that the graft union is always kept above soil level. Also, try to keep root disturbance to a minimum when replanting.
It is also recommended that the tree be staked, both in a container and in the ground, until it is established.
Mulch can be applied to both container and ground planted trees as this is a great way to help retain soil moisture. Although any mulching aggregate can be used, Pine straw is considered to be the best mulch for Olive trees.
Olives: Ongoing Care & Maintenance
Olive trees require minimal ongoing care and maintenance.
Any suckers that have formed around the base of the tree can be removed and mulch should be topped up as required.
As they are fairly drought tolerant, once established they will only need regular watering if grown in a container. In the ground they need no water unless there is a prolonged dry period.
As they are generally hardy, container grown trees will only need to be protected or taken inside if there is a risk of hard or prolonged frost.
Olive trees do not tend to have issues with pests or diseases but it is good practice to monitor your plants regularly just in case. The most common pests are scale insects and the Olive fruit fly.
The only pruning that is advised is light corrective pruning – the removal of any branches that are dead, diseased, damaged or crossing. This should not be needed during the first 2-3 years of growth but can be carried out at any time of year as long as there is no risk of frost or long dry period. If pruning a tree that is being grown for fruit, the best time to prune is directly after harvest.
The Olive tree can be propagated by seed and cutting.
Seed should be collected and sown when fresh in autumn, into a pot of well-drained seed sowing compost. Place in a bright position away from direct sunlight and keep moist. Seedlings will emerge in spring and can be potted on once the first true leaves have appeared.
Semi-ripe cuttings are taken in summer. Select a 12 – 15cm long, pencil thick section of stem that contains 3 – 4 nodes and trim it to just below a node. Place the stem cuttings around the sides of a pot filled with cutting compost. Olives also root well in pure sand or vermiculite. The application of rooting hormone and/or use of bottom heat will result in a higher success rate. Place in a bright position away from direct sunlight and keep moist. Roots should appear within 6 – 8 weeks and once well developed can be potted on into individual pots.
The Olive Tree can also be propagated by budding and grafting.
Olives: Taxonomy and naming
Genus: Olea (Latin name meaning ‘greenhouse shrub’;
Species: europaea (Meaning ‘European’)
See http://www.theplantlist.org/tpl1.1/record/kew-355112 for a full list.
Common names: Common Olive, Cultivated Olive, Edible Olive, European Olive, Lady’s Oil, Olive Oil Plant, Sweet Oil Plant.
The Olive is one of oldest fruits known to man. Fossil evidence shows that it originates from Italy and the Eastern Mediterranean and has been found going as far back as 20 – 40 million years ago. Fossilised leaves found on the Greek island of Santorini have been dated at 37,000BP (Before Present) and others have been found that are estimated at 60,000BP.
It is believed that Olive trees were first cultivated 7000 years ago in the Mediterranean. Tablets of written evidence, Olive pits and Olive wood fragments have been found in ancient tombs that go back to the Early Bronze Age. It is even suggested that Olive cultivation may have been the source of the wealth of the Minoan civilisation.
Olive oil has long been considered sacred and it is still used today in religious ceremonies around the world. In the Christian Book of Genesis, an Olive branch was brought to Noah by a dove as a symbol that the flood had ended.
The Olive branch is an ancient symbol of peace and the saying ‘to offer an Olive branch’ means to make an offer of peace or reconciliation.
Crowns of Olive branches have, throughout history, been offered to the victors of both games and wars; and Olive oil was the source of the ‘Eternal Flame’ of the original Olympic Games.
An extremely long lived tree, the Olive has been described on numerous occasions in historical texts, with mentions often found of plantings in the honour of various rulers and famous historical characters many of which, it is claimed, are still living today. Of all the many claims of the oldest specimen, the one with scientific confirmation is a tree in Malta that radiocarbon dating has put at being around 2000 years old.
In modern times, the Olive is one of most extensively cultivated fruit crops in the world with the Mediterranean being the largest commercial growing region producing 95% of the worlds Olives.
Olives: Distribution and Habitat
Olea europaea is native to areas of Southern Europe surrounding the Mediterranean, and also to North Africa. There are six sub-species which are considered as naturalised across the Mediterranean, America, Asia and Africa and they grow in a wide range of habitats.
The Olive Tree is a slow growing, evergreen tree with a very rugged looking, branching habit. As they age, they develop truly ancient looking gnarly, twisted trunks and they can reach a height and spread of approximately 10 metres after 20 – 50 years.
Narrow, oblong, leathery leaves measuring 5 – 7cm long and 1 – 3cm wide are grey-green above and silver underneath. Protective cuticles on the leaves help prevent water loss. Short racemes of tiny white, fragrant flowers appear in late summer, from leaf axils on previous years wood. Edible, oval fruits follow in autumn and are green in colour, ripening later in the season to purple or a reddy-brown/black colour.
Olea europaea is not listed as being at risk in the wild but, in Southern Italy there is a very serious threat of localised extinction should the deadly disease Xylella take hold. Original, wild populations in Southern Europe are also at threat of being overtaken by feral plants which are spreading out into the wild from commercial groves. The Olive tree has become a major, woody weed that displaces native vegetation and the problem is not limited to Europe.
In Southern Australia the seed is spread from cultivated groves by the native Red Fox, and many bird species including the Emu. The seeds germinate and grows into a tree with a dense canopy which prevents regeneration of native tree species.
The presence of oil rich, highly flammable Olive trees substantially increases the risk of fire in native sclerophylla woodlands – areas that are already very dry and bushfire prone.
Olive trees are not considered to be particularly high in biodiversity. This may be because the flowers are wind pollinated and therefore do not need to produce nectar to attract pollinating insects; but may be also because the fruit is so bitter. The fruits are loved by birds who eat them whole and disperse the seed through their droppings as they travel. Small insects that feed on sap and leaves find the trees attractive, due to the saps nutritional properties, and many insects will live in the deep cracks and crevices of the bark.
The Olive tree can thrive under extremely dry conditions, requires very little maintenance and provides shade and cover for wildlife. It is for these reasons that thousands of trees have been planted into arid areas of Israel as part of an study into desertification. So far the research has shown the scheme to be highly beneficial for the local wildlife. Mammal, reptile and bird numbers have all grown since the introduction of the new Olive groves.
The Olive has been used throughout all recorded history. The fruit and oil are of high value nutritionally. They are low in carbohydrates, high in Oleaic acid (a healthy monounsaturated fat), high in anti-oxidants and are a good source of Vitamin E, Iron, Copper and Calcium. The oil has also been used as fuel for lamps.
Olives are linked to a number of health benefits including decreased inflammation and improved heart health; Olive leaf extract is being tested for its ability to reduce blood pressure. The oil is particularly nourishing for the skin and hair and has been used in personal care rituals through history. It is used today in a wide range of cosmetic products.
Olive wood is prized by woodworkers for its durability, grain pattern and colour. Olive wood products are often beautiful but can be relatively expensive to buy due to lack of wood availability. The tree is slow growing and fairly small and clearly of a higher value commercially when grown for fruit production that when grown for crafting.
The Olive tree is rated 10/10 – ‘Extremely Allergenic’, on the OPALS allergy scale. It’s allergenic potential is so high because the flowers are wind pollinated.
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