Fertilising guide

How to fertilise Avocado (Persea americana)— schedule & NPK

Also called Hass avocado, Fuerte avocado, alligator pear.

About Avocado

Persea americana · also called Hass avocado, Fuerte avocado · edible

Avocado is an evergreen tree from Central America that grows easily as a houseplant from a kitchen pit, though indoor specimens rarely fruit. Outdoor trees in zones 9-11 produce reliably once mature. Toxic to pets, especially birds.

The avocado (Persea americana, family Lauraceae) is a subtropical evergreen tree. Per the ASPCA its leaves, fruit, seeds and bark contain persin, which can cause vomiting and diarrhea in dogs and more severe cardiovascular signs in birds, rabbits, horses and ruminants.

Because the root system is shallow, the tree responds best to small, frequent nutrient applications rather than infrequent heavy feeding.

Growth habit: Evergreen tree

Watch for — Brown leaf tips: Chloride or salt build-up from tap water; flush with rainwater periodically.

Sources: aspca.org, ipm.ucanr.edu, ucanr.edu

What fertiliser avocado actually wants — and why

Avocado is a hungry evergreen fruiter with specific needs — a dedicated citrus feed, switched between summer and winter formulas, keeps it cropping and green.

For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for avocado: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.

How often to feed avocado, and which months

Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For avocado:

A balanced citrus or fruit-tree feed monthly during the growing season. In practice: a summer citrus feed regularly (often roughly fortnightly) from spring to autumn, switching to a winter citrus feed at a reduced rate over the colder months — citrus feed year-round, unlike most container plants.

The dormant-season rule matters more than the exact interval: skip feeding entirely when avocado is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.

What strength to mix for avocado

Follow the citrus-feed label rate for avocado and use the correct seasonal formula. The trace-element content matters as much as the NPK — substituting a general feed is the usual cause of yellowing.

Feeding always goes onto already-damp soil, never dry roots — water avocado first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the avocado watering schedule.

Signs you are over-feeding avocado

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for avocado:

Salt crust on the soil and scorched, browning leaf tips.
Excess soft leafy growth with poor fruit set from too much nitrogen.
Leaf drop shortly after an over-strong feed.

Signs you are under-feeding avocado

Yellowing leaves — overall pale, or yellow between green veins (magnesium/iron).
Poor flowering and fruit set, small or dropping fruit.
Weak new growth and a generally tired tree.

If the symptoms point at watering, light or roots rather than nutrition, the full avocado care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Potted avocado accumulates salts and benefits from a thorough plain-water flush every couple of months until it drains freely, plus an annual repot or top-dressing of fresh citrus compost.

Organic vs synthetic feeds for avocado

Organic options

Well-rotted manure or compost mulch plus seaweed and an Epsom-salts (magnesium) drench supports avocado naturally. UK: organic citrus feed or seaweed + Epsom salts; US: Espoma Citrus-tone or Dr. Earth Citrus.

Synthetic / liquid feeds

A proprietary summer and winter citrus feed — UK: Westland or Vitax Citrus (summer/winter); US: Miracle-Gro or Espoma Citrus. Using the right seasonal formula is the key to keeping avocado green and cropping.

Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.

Fertilising avocado — frequently asked questions

What fertiliser does avocado need?

A specialist citrus fertiliser, which carries the higher nitrogen plus the magnesium, iron and trace elements citrus need — generic feeds quickly leave it yellow and chlorotic. Many ranges have a summer (higher-N) and a winter (lower-N) formula. Avocado is a hungry evergreen fruiter with specific needs — a dedicated citrus feed, switched between summer and winter formulas, keeps it cropping and green.

How often should I feed avocado?

A balanced citrus or fruit-tree feed monthly during the growing season. A balanced citrus or fruit-tree feed monthly during the growing season. In practice: a summer citrus feed regularly (often roughly fortnightly) from spring to autumn, switching to a winter citrus feed at a reduced rate over the colder months — citrus feed year-round, unlike most container plants.

What strength of feed for avocado?

What does over-feeding avocado look like?

Salt crust on the soil and scorched, browning leaf tips. Excess soft leafy growth with poor fruit set from too much nitrogen. Leaf drop shortly after an over-strong feed. Feeding avocado an ordinary plant food instead of a citrus-specific one is the defining mistake — it lacks the magnesium and iron citrus demand, and the leaves yellow between the veins no matter how often you feed.

Should I flush the soil of avocado?