Olive Tree Care Guide for Australia

How Often Should You Water an Olive Tree?

Water an olive tree deeply, then allow the upper soil to begin drying before watering again. Newly planted trees need regular moisture while roots establish, while mature in-ground trees tolerate longer dry periods. Weather, soil and drainage matter more than a fixed schedule.

As a starting point, check a new tree about weekly during its first warm season and water when the root zone is beginning to dry. Established trees may only need supplementary water during extended dry weather, but consistent moisture during flowering and fruit development can support a better crop. Potted olives need more frequent checks, especially in summer.

Yellowing, leaf drop or drooping can come from both dry roots and waterlogging. Feel the soil before adding water. If it stays wet for days, improve drainage rather than adding fertiliser.

How and When to Prune Olive Trees

Prune olive trees after harvest and before strong spring growth, once the main frost risk has passed. Aim for a low, open canopy that lets sunlight and moving air reach the inner branches. Olive fruit is produced on one-year-old wood, so removing too much new growth every year can reduce the next crop.

• Remove dead, damaged, diseased and crossing branches first.
• Cut basal suckers and vigorous upright water shoots that crowd the centre.
• Thin selected branches to create an open vase or goblet shape.
• Reduce height gradually rather than heavily cutting the whole canopy at once.
• Disinfect tools between diseased trees and make clean cuts just outside the branch collar.

Light shaping can be done during active growth, but avoid hard pruning during flowering, extreme heat or immediately before severe frost.

How Should You Feed an Olive Tree?

Feed during active growth from spring to early autumn and avoid pushing soft growth during winter dormancy. A balanced fertiliser suits general olive growth, but the correct rate changes with tree size, soil and whether the tree is in a pot. For product choice and exact mixing rates, use our olive tree fertiliser guide.

Common Olive Tree Problems in Australia

Why Are Olive Leaves Turning Yellow?

Yellow olive leaves are commonly linked to saturated roots, compacted soil, an unsuitable soil pH or a nutrient deficiency. Check drainage and moisture first. If the soil structure and watering are sound, inspect the pattern of yellowing and consider a soil or leaf test before adding more fertiliser.

Why Is an Olive Tree Not Flowering or Fruiting?

A young tree may simply be immature. Other common causes include insufficient winter chill, too much shade, severe pruning of fruiting wood, heat or frost during flowering, poor nutrition and limited compatible pollen. Give the tree full sun, avoid over-pruning and check whether its cultivar benefits from a second compatible olive nearby.

What Is Peacock Spot?

Peacock spot is a fungal leaf disease recognised by dark circular lesions, often with yellowing around them. It is most troublesome in wet, humid conditions. Remove badly affected fallen leaves, improve canopy airflow, avoid prolonged leaf wetness and use only treatments registered for olives according to their Australian label.

What About Olive Lace Bug, Scale and Anthracnose?

Olive lace bug damages leaves from underneath, scale appears as fixed bumps on stems or foliage, and anthracnose can rot fruit in warm wet conditions. Inspect trees regularly, remove heavily affected material, reduce canopy humidity and seek locally registered control advice when damage is spreading.

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Olive Tree FAQs

How Long Do Olive Trees Live?

Olive trees can live for hundreds of years, and some ancient specimens are believed to be more than a thousand years old. Their long life depends on drainage, climate, disease pressure and care.

How Tall Does an Olive Tree Grow?

Garden olive trees are commonly maintained at about 3–8 metres. Old, unpruned trees in favourable conditions can approach 15 metres, while regular pruning can keep patio and suburban trees much smaller.

How Long Before an Olive Tree Produces Fruit?

Many nursery-grown trees produce some fruit after about 3–5 years, but variety, tree age at purchase, climate and care all affect timing. A larger reliable crop usually takes longer.

Do You Need Two Olive Trees for Fruit?

Some olive cultivars are self-fertile, but a compatible second cultivar flowering at the same time can improve pollination and fruit set. Check the cultivar label or ask the nursery which polliniser suits your tree.