🌳 Olivier

Use well-drained, aerated soil. Olive trees do best in slightly loamy or sandy/gravelly soils, and tolerate calcareous soils. Avoid waterlogged sites and heavy compacted clays; improve structure and drainage by incorporating coarse sand/gravel (or similar mineral aggregate) and organic matter, or plant on a slight mound/raised bed so that water drains away from the root zone. An overall neutral to alkaline pH is suitable for olives (around 6.0-8.5), although they can adapt if drainage is excellent. In containers, use a draining mix (quality potting soil mixed with perlite, pumice or sand) and provide large drainage holes; keep fertility moderate rather than excessively rich.

Olive (Olea europaea) is best propagated by cuttings, layering or grafted nursery stock. Plants grown from seed are slow, variable and not true to type. From seed: - Use ripe fruit. Remove pulp completely and wash pits thoroughly; any remaining flesh may promote rotting. - Overcome hard, water-resistant endocarp: carefully crack or abrade the kernel (or remove the endocarp if you can do so without harming the seed) to accelerate and improve germination. - Soak prepared stones/seeds in clean water for 24 to 48 hours, changing the water every day. - Sow in spring or at any time when you can maintain high levels of heat and light. Use a sterile, non-draining medium (e.g. seed compost mixed with fine sand or perlite). - Sow at about the depth of the stone and firm up slightly. Maintain regular, but never soggy, humidity. - Provide bright light and even heat; a background temperature of around 20-25°C is beneficial. - Germination is often slow and irregular (weeks to months). Pot once seedlings are large enough to handle, and grow them in a bright, frost-free spot over the first winter in cool climates. Planting young olive trees (nursery plants): - Plant in the open ground in spring, when the risk of frost has passed and the soil is warming up. - Location: full sun and well-drained soil. Avoid waterlogged areas; on heavier soils, improve drainage with gravel and plant slightly raised to prevent the crown from sitting on damp soil. - Dig a wide hole, plant to the same depth as in the pot, tamp down and water abundantly to help the plant establish itself. - Water regularly during the establishment period (first growing season), then reduce watering: olives prefer deep, infrequent watering once established. - Mulch to conserve moisture and suppress weeds, avoiding the trunk. - Protect young plants from heavy frosts and cold winds. In colder regions, grow them in a large container to shelter them in winter.

Fertilize olive trees (Olea europaea) sparingly; excess nitrogen (N) promotes vegetative growth and can reduce flowering/fruiting and increase susceptibility to cold damage. Base fertilization on soil analysis (and leaf analysis, where applicable), and correct only what is necessary. - Trees in the ground, established trees: Apply the main annual fertilizer in early spring, when growth resumes. Use a light dose of a balanced or slightly low-nitrogen fertilizer (usually in the ~5-5-5 to 10-10-10 range) or a modest application of well-decomposed compost. Spread under the canopy/drip line (not against the trunk) and water. On low-fertility sites, divide treatment into two smaller applications (early spring and early summer). Avoid late summer and autumn. - Young/forming trees: Use smaller, more frequent applications in spring or early summer (or a controlled-release product) to promote canopy establishment, but do not apply too much nitrogen. - Fruit trees: Maintain sufficient potassium (K) to promote fruiting and oil quality; avoid high N in relation to K. Treat deficiencies identified by tests, rather than making routine mass additions. - Containers: Nutrients are rapidly leached. Use a controlled-release fertilizer in spring and supplement with a light liquid application from spring to midsummer; stop or greatly reduce application in late summer. - Micronutrients : Iron chlorosis is common on alkaline/chalky soils; treat only if confirmed (soil/leaf analysis and symptoms). Boron can also limit flowering and fruit set, but its margin of safety is narrow; only apply the product in cases of proven deficiency, and scrupulously respect the doses indicated on the label. - General practice: Maintain a layer of mulch/compost to improve organic matter; keep fertilizers several centimetres from the trunk; irrigate after application to get nutrients into the root zone.

Apply a 5-8 cm layer of mulch over the root zone (up to the drip line) to suppress weeds and buffer soil temperature and humidity. For olive trees (drought-tolerant and sensitive to waterlogged soils), use a free-draining mulch: composted bark/wood chips in dry climates; in humid climates or any site with slow drainage, prefer a mineral mulch (gravel/stone) to avoid keeping the crown and surface soil too moist. Keep the mulch 10-15 cm from the trunk to reduce crown rot and pest problems. Refresh it in spring and top it up as it decomposes; avoid over-mulching or piling the mulch against the trunk, which can increase moisture retention and the risk of disease.

Olive (Olea europaea) products, particularly extra-virgin olive oil and olive leaf preparations, are used for their cardio-metabolic and anti-inflammatory benefits. - Cardiovascular support (the strongest evidence in humans for edible oil): Extra-virgin olive oil is an important source of monounsaturated oleic acid and phenolic antioxidants (e.g. hydroxytyrosol, oleuropein derivatives). Its regular use as the main dietary fat (as in Mediterranean diets) is associated with reduced cardiovascular risk and improvements in markers such as lipid profile and reduced LDL oxidation. - Anti-inflammatory and antioxidant activity: Olive phenolic compounds (notably hydroxytyrosol and oleuropein-related compounds) have antioxidant effects and modulate inflammatory pathways; these actions are thought to contribute to the observed cardio-metabolic benefits. - Blood pressure and metabolic effects (moderate/variable clinical evidence for leaf extracts): Olive leaf contains secoiridoids (in particular oleuropein) with antioxidant/anti-inflammatory activity. Standardized leaf extracts have been studied for their modest hypotensive effects and potential improvements in glucose regulation and lipid parameters, although results vary according to extract composition, dose and study design. - Antimicrobial activity (mainly laboratory): Olive phenolic compounds show antibacterial and antiviral activity in vitro; clinical relevance is less well established. Overall, dietary extra-virgin olive oil has the strongest clinical evidence for cardiovascular health; data for olive leaf preparations are promising, but more variable and product-dependent.

Olive trees should be pruned mainly in late winter or early spring (after the risk of frost has disappeared and before the onset of strong spring growth). In mild climates, light grooming can also be carried out after harvest; avoid heavy pruning in autumn/early winter, as frost may damage the olive trees. Training objective: a well-lit, airy crown - generally an open center/vase shape with 3 to 5 main scaffolding branches. Good light penetration improves flowering, fruit quality and reduces disease pressure. Order of removal (routine maintenance): - Dead, damaged or diseased wood (cut away healthy tissue). - Crossed/tangled shoots and inward-growing shoots that shade the center. - Weak, internally branched shoots and branches hanging low to the ground or in alleys. - Suckers at the base and vigorous, upright water shoots on the main branches (remove them early and repeatedly). Growth habit: olive trees bear fruit largely on the previous season's shoots, so avoid removing too much one-year-old wood. Prefer thinning cuts (removing whole shoots/branches right back to their origin) to heading cuts, which often stimulate unwanted vertical regrowth. Controlling height and spread: keep trees manageable by selectively removing or shortening the tallest branches to a lower, outward-facing lateral branch (reduction cuts), while maintaining an open center. Young trees (2 to 4 years old): favour formative pruning - select 3 to 5 well-spaced scaffolds, remove competing main branches and keep the center open. Avoid hard pruning, which delays harvesting. Mature/neglected trees: renovate gradually over 2 or 3 seasons to limit yield loss and excessive regrowth; as a general rule, don't remove more than a third of the canopy in any one year. After hard cutting, expect a lot of water shoots and thin them out quickly. Technique and hygiene: make clean cuts just outside the branch collar; use sharp, clean tools. Disinfect tools between cuts in case of disease (and between trees if problems are suspected). It is generally not necessary to paint wounds; priority should be given to correct cutting and hygiene.