Originally published on Herbal Medicine from Your Garden
Olives are the fruit of the tree Olea europaea, also sometimes called oliveleaf, and mu xi lian in Chinese. Green and black olives are different stages of ripeness, though some varieties are always picked green.
There are 6 subspecies: Olea europaea subsp. cerasiformis aka O. europaea var. cerasiformis or O. europaea var. maderensis; Olea europaea subsp. cuspidata (African, brown or wild olive) aka O. africana, O. chrysophylla, O. cuspidata, O. europaea subsp. africana, O. ferruginea, O. sativa var. verrucosa or O. verrucosa; Olea europaea subsp. europaea aka O. europaea subsp. oleaster or O. oleaster; Olea europaea subsp. guanchica; Olea europaea subsp. laperrinei aka O. laperrinei; and Olea europaea subsp. maroccana aka O. maroccana.
The olive has been cultivated since the time of the Ancient Greeks, and is now naturalized across much of the planet and widely grown commercially. It is best suited to a Mediterranean climate with cool winters. To provide a decent crop, olive trees require 2-300 hours of dormancy at temperatures between 7.5°C/45°F and 10°C/50°F (easily provided by a UK winter), during which time day and night temperatures must be distinctly different. Unless you have a room where you can let the ambient temperature fluctuate naturally, you’re unlikely to get fruit from an indoor grown tree. On the other hand, if your outdoor tree is subjected to long periods below -10°C/14°F, it will be damaged and produce a smaller crop, although it should recover the following year.
Olives can be grown in containers, otherwise plant them in well drained soil which isn’t too rich, preferably against a south- or west-facing wall. Water weekly until established and keep weed free for the first few years. Pinch out container-grown trees at about 1.5m (5′) to encourage bushiness.
Water fortnightly with seaweed fertilizer during spring and summer (May to September in the UK). Prune in spring and early- to mid-summer; just thin out the branches to allow air flow, remove dead and diseased branches and any that spoil the shape of the tree.
Depending on the age of the tree you have purchased, you can expect fruit 3-5 years after planting. It will start to appear in late Summer. Most varieties can be picked green or left to turn black. In any case, it’s best to take what remains before the cold, wet days of Fall set in. Pick leaves as required for remedial use, and take small quantities of bark, being careful not to ring the tree, in early Fall for drying.
Olives and olive oil are superfoods, but they are also extremely high in calories, so regular snacking on olives may be impractical. Olive oil is one of the healthiest cooking oils, as it does not turn to trans-fats when heated. It is sometimes used for making margarine, and often in preparing Italian and other Mediterranean-style food, so can easily be included in your daily diet. Extracting the oil from olives is impractical at home without special equipment capable of crushing the olive pit/stone.
Decoction: Add 1 tsp well-crushed bark or chopped leaves to 250ml (1 US cup, 8 fl oz) cold water in a non-metallic pan. Bring to a boil, reduce to a simmer and continue heating for 10-15 minutes, strain off root and use the liquid hot or cold. Dosage: Up to 250ml (1 US cup, 8 fl oz) a day, split into 3 doses.
Olive oil is a laxative, promotes bile production and is soothing to mucous membranes and skin. It also helps combat hyperacidity and treats peptic ulcers. Externally it can be used to treat stings, burns and itchy skin, also as a base for liniment and ointment.
A decoction of leaves is used to treat fever, nervous tension, high blood pressure and to lower blood sugar. It can also be used externally to treat cuts and grazes.
A decoction of bark has been used as a substitute for quinine to treat malaria.
Recent research has found that olive leaf extract is very beneficial for preventing and treating high blood pressure, rheumatoid arthritis, osteaoarthritis and lowering blood sugar and LDL cholesterol levels.
The gum which collects in warm countries is used to treat cuts and grazes.
You can make a hair tonic by mixing olive oil with alcohol.
In Bach flower remedies Olive is used for exhaustion and mental fatigue.
Olive oil is used as a base oil in aromatherapy. One application is with rosemary, for dandruff. Find out more about olive oil in aromatherapy.
If you decide to grow olives, as with all remedies grown at home, I recommend that you use organic methods, so as to be sure that you don’t end up ingesting lots of chemicals along with your food or medicine. General articles on organic methods can be found on our sister site, the Garden Zone.