Good Fertilizer for Avocado Tree: Boost Growth, Roots & Fruit

When it comes to producing healthy, fruit-bearing avocado trees in Australia, the key is choosing a good fertilizer for avocado tree growth. Whether you’re growing a Hass, Bacon, or Wurtz avocado, these trees need precise nutrition to support their roots, leaves, flowers, and eventually, delicious fruit. Avocado trees have unique nutritional demands that change throughout the year—making consistent feeding essential.

How Avocado Trees Grow in Australia

Avocados are evergreen trees that thrive in warm, frost-free climates. In Australia, they grow well in regions like coastal NSW, QLD, and parts of WA. A mature avocado tree can grow up to 10 metres high, and its growth cycle involves distinct stages:

Spring: New shoot and leaf development
Late Spring/Early Summer: Flowering and fruit set
Summer to Autumn: Fruit growth and oil production
Winter: Minimal activity, but root health still matters

Each of these phases requires different nutrients. A good fertilizer for avocado tree performance must support nitrogen needs early in the season while offering balanced phosphorus and potassium to support flowering and fruit development.

Nutrient Needs for Avocado Trees

Avocado trees are particularly sensitive to nutritional deficiencies. The most important nutrients include:

Nitrogen (N): Promotes leaf and canopy development
Phosphorus (P): Supports root strength and flower formation
Potassium (K): Enhances fruit quality and resistance to stress
Magnesium (Mg): Maintains chlorophyll and leaf colour
Calcium (Ca): Strengthens fruit and root tissue

Without a consistent feeding plan, avocado trees often show yellowing leaves, poor flowering, or premature fruit drop. To avoid this, use a complete, balanced NPK fertiliser tailored to trees with both foliage and fruiting demands.

The Best Fertiliser for Avocado Trees in Australia

The ideal fertiliser for an avocado tree provides complete nutrition across all growth stages—from leaf flush to fruit maturity. That’s why we recommend CompleteGrow All Purpose Liquid NPK Fertiliser (20-20-20) as the most effective, all-in-one solution.

This professional-grade liquid fertiliser contains:

20% Nitrogen: Fuels leaf and shoot growth
20% Phosphorus: Enhances root strength and flowering
20% Potassium: Boosts fruit quality, flavour, and size

The 20-20-20 blend is ideal for avocado trees at all stages—whether newly planted or fruit-bearing. It’s highly soluble and fast-acting, making it perfect for backyard trees and commercial orchards alike.

When to Apply Fertiliser to Avocados

Spring: Begin fertilising as buds form and new leaves appear.
Summer: Continue monthly feeding to support flowering and fruit set.
Autumn: Light feeding to support root strength as fruit matures.
Winter: Stop fertilising unless in warm tropical climates (like far north QLD).

Mix as directed and water in well. For container-grown avocado trees, apply at half strength every 2–3 weeks for best results.

FAQs About Fertilising Avocado Trees

What is a good fertilizer for avocado tree health?

A good fertilizer for avocado tree health should be balanced, water-soluble, and contain all three macronutrients (NPK) in equal measure. CompleteGrow 20-20-20 Liquid Fertiliser delivers this in one easy-to-use formula, supporting both vegetative growth and fruit production.

Can I use citrus fertiliser on avocados?

While some citrus fertilisers have overlapping nutrients, they often lack the balanced NPK needed for avocado tree performance. A dedicated solution like CompleteGrow 20-20-20 ensures your avocado gets everything it needs—without overdoing any one element.

Why are my avocado tree leaves turning yellow?

Yellowing leaves are often a sign of nitrogen or magnesium deficiency. Feeding with a good fertilizer for avocado tree growth—such as CompleteGrow 20-20-20—quickly replenishes these nutrients and promotes greener, more vigorous foliage.

How often should I fertilise my avocado tree?

Feed avocado trees monthly during active growth from spring to early autumn. For large in-ground trees, apply CompleteGrow 20-20-20 every 4–6 weeks. For potted trees, fertilise every 2–3 weeks at a reduced concentration.

Grow Better Avocados with CompleteGrow

Whether you’re nurturing a young avocado sapling or harvesting your first fruit, choosing a good fertilizer for avocado tree health makes all the difference. CompleteGrow 20-20-20 Liquid Fertiliser offers a powerful, balanced, and proven solution trusted by Australian growers. Improve leaf quality, boost flowering, and produce better fruit—naturally.