Fertilising guide

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

Also called Hass avocado.

More about hass avocado

About Hass Avocado

Persea americana 'Hass' · also called Hass avocado · tropical

'Hass' is the world's leading avocado cultivar, a Guatemalan-type prized for its rich, buttery flesh and pebbly skin that turns purple-black when ripe. A type-A flowering avocado, it needs full sun, sharp drainage and protection from frost, and benefits from a type-B pollinator nearby for heavier crops.

Growth habit: Evergreen tree with a fairly upright but spreading, dense canopy; type-A flowering habit. Vigorous in the ground but kept compact in containers; grafted trees fruit far sooner than seedlings.

Watch for — Leaf-tip burn from salts: Chloride and salt accumulation scorches leaf tips. Use low-salt water, leach pots periodically, and avoid letting the mix dry out completely.

What fertiliser hass avocado actually wants — and why

Hass 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 hass 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 hass 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 hass avocado:

Feed regularly through spring and summer with a balanced fertiliser plus supplementary nitrogen and zinc, which avocados use heavily. Watch for chlorosis and apply chelated iron on alkaline soils. Reduce feeding in autumn and stop over winter. 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 hass 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 hass avocado

Follow the citrus-feed label rate for hass 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 hass avocado first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the hass avocado watering schedule.

Signs you are over-feeding hass avocado

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for hass 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 hass 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 hass avocado care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Potted hass 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 hass avocado

Organic options

Well-rotted manure or compost mulch plus seaweed and an Epsom-salts (magnesium) drench supports hass 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 hass 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 hass avocado — frequently asked questions

What fertiliser does hass 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. Hass 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 hass avocado?

Feed regularly through spring and summer with a balanced fertiliser plus supplementary nitrogen and zinc, which avocados use heavily. Watch for chlorosis and apply chelated iron on alkaline soils. Reduce feeding in autumn and stop over winter. Feed regularly through spring and summer with a balanced fertiliser plus supplementary nitrogen and zinc, which avocados use heavily. Watch for chlorosis and apply chelated iron on alkaline soils. Reduce feeding in autumn and stop over winter. 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 hass avocado?

What does over-feeding hass 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 hass 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 hass avocado?