How to grow avocado

Pick the best-drained spot you have — a slope or a rise where water runs off, never a hollow where it pools after rain, and not a heavy clay bottom.

Test the ground: after a heavy rain, watch where puddles sit for hours. Any spot that stays wet needs mounds and drains before a tree goes in.

On heavy or clay soils, plant on a mound or raised bed — about one stride wide (0.9–1.5 m) and knee-high (0.3–0.6 m). The mound lifts the shallow roots up out of the wet.

Dig shallow drains or channels to lead rainwater away from where the trees will stand, especially on flat or low ground.

Check the soil is not too sour: avocado likes a pH of about 6.0–6.5 (mildly sour). If it needs lime, spread it now — lime works slowly and must go on months ahead.

Mark your planting spots 8 strides apart (about 8 m) in every direction, so grown trees have room and air can move through — a crowded, still, damp orchard feeds root rot and leaf disease.

Buy grafted trees, not seedlings grown from a pip (a seed). A grafted tree is a chosen fruiting variety joined onto a tough root — it fruits in 2–4 years and comes true to type; a pip tree is a gamble and takes far longer to bear.

Buy from a reputable nursery selling certified, disease-tested stock — trees checked free of sunblotch and grown on clean roots. Ask to see the certificate.

Buy both flowering types — Type A and Type B. Each avocado flower is female for only a few hours, then reopens the next day as male, so one tree is almost never catching and shedding pollen at the same moment. A and B trees take turns, so together they pollinate each other and set far more, bigger fruit.

Match the type to your area: cooler, higher ground suits the hardier Mexican and Guatemalan trees (Hass is Guatemalan); hot, low or salty ground suits the West Indian trees. Ask the nursery or check your recommendation.

Look each tree over: a straight single stem, a clean graft join (the low bump where the variety was joined on) with no oozing, healthy green leaves, and no yellow streaks or narrow, twisted, strap-like leaves — those are a sunblotch warning. Reject any doubtful tree.

Plant in the first two weeks of the rains, into a moist, well-drained mound or spot, at your 8-stride (≈8 m) spacing.

Dig a hole a little wider than the bag the tree came in, but no deeper — the tree must sit at the same depth it grew in the bag, never lower.

Slip the tree out of the bag without breaking the root ball, set it in, and firm the soil gently. Keep the graft join (the low bump on the stem) a good hand-span (≈20 cm) clear above the soil — if it is buried, rot and trouble follow.

Water it in well to settle the soil around the roots and close any air pockets.

Spread a thick hand-span (≈20 cm) layer of coarse mulch — straw, dry leaves, wood chips, prunings — in a wide ring out to the edge of the branches, but leave a bare gap of a hand-span (≈20 cm) around the trunk so the stem stays dry and does not rot.

When you water, soak deeply — enough to wet the whole shallow root zone (the top half-metre or so), out to the edge of the branches where the feeder roots reach.

Then wait. Let the top of the soil dry before you water again — push a finger in near the branch edge and water only when the top 3–5 cm (a finger-joint or two) are dry.

Water about every 7–14 days — more often in heat and on sandy soil, less in cool or cloudy spells.

Never let water stand around the tree. If it ponds, spread the water wider or fix the drainage — soggy roots rot.

In the first two weeks after planting, paint the trunk and the exposed main branches white, from the ground up into the lower canopy.

Use a lime wash (slaked lime stirred into water) or a white water-based (PVA) paint thinned with water — never oil paint, which suffocates the bark.

Coat the side that faces the midday and afternoon sun most heavily, where scald bites hardest.

Re-coat whenever the white wears thin or fades, and after any pruning that opens up bark which used to be shaded.

Walk every tree once a month through the first 2–3 years, checking the canopy, the trunk, and the soil around each tree.

Root rot (Phytophthora): look for the canopy thinning out, small pale, yellow-green, wilting leaves, and branch tips dying back — worst on wet, low ground. Scratch the soil at the branch edge: healthy feeder roots are white; rotten ones are black and brittle.

Sunburn: look for pale, scalded, cracked bark on the sun-facing side of the trunk or branches — re-whitewash straight away.

Frost: after a cold night, look for blackened, wilted young leaves and soft, drooping shoot tips — a sign to protect the tree on the next cold nights.

Write down which tree showed what, and act early — a problem caught on one tree is far cheaper than one spread across the whole block.

Feed roughly every 2–3 months through the growing season, splitting the year's ration into several small feeds rather than one big dump.

Use a balanced fertiliser (not a high-nitrogen one), and add zinc and boron — often as a leaf spray (sprayed onto the leaves), which is how the tree takes these two up best.

Spread granular fertiliser in a ring under the canopy out to the branch tips, where the feeder roots are — not against the trunk — and water it in.

Keep fertiliser off the trunk and off wet leaves, and away from food, water and children; wash your hands afterwards.

Apply the root-protectant (phosphonate) about every 3–4 months, following the product label for the rate and method (trunk injection or leaf spray).

Time leaf sprays to a new flush — when the fresh leaves have hardened off — because the tree carries the protectant down to the roots best then.

Each round, walk the drains and mulch: clear blocked channels, re-shape mounds, and top up mulch. The protectant fails if the roots are sitting in water.

Spray safely: cover your skin, eyes and nose, spray in the cool of the day with the wind at your back, keep it off food, and wash yourself and the equipment afterwards. Respect the pre-harvest interval — the wait between spraying and picking printed on the label.

Walk the trees once a month, checking the canopy, the new flush of leaves, and the soil at the branch edge.

Root rot (Phytophthora): as before — thinning canopy, small pale leaves, dieback, worst on wet ground; black, brittle feeder roots when you scratch the soil.

Scale insects: look for tiny limpet-like bumps stuck along the stems and leaf veins, often with sticky honeydew (their sugary droppings) and a black sooty mould growing on it, and ants running up the trunk.

Mites: look for fine pale speckling or bronzing on the leaves, and sometimes very fine webbing — worst in hot, dusty, dry spells.

Sunblotch check: glance over the new flush and the bark for yellow, cream or pink streaks, narrow, strap-like, twisted leaves, or rectangular cracking of the bark. Mark any suspect tree, and if it is confirmed, pull it out and destroy it — there is no cure.

As the flower buds swell (about 2 weeks before bloom), check whether wild bees are already visiting. If few are about, bring in hives and set them among the trees.

Place hives near the block, in the sun and out of the wind, so the bees start early each day and work the flowers hard.

Give bees clean water nearby and keep flowering weeds on the orchard floor cut low, so the bees stay on the avocado bloom rather than on weeds.

Do not spray any insecticide on open flowers — it kills the bees you depend on. If something must be sprayed, do it before bloom or after the petals fall, in the cool of evening when bees are not flying.

Spray boron onto the leaves (a foliar spray, meaning onto the foliage) in the month before the flowers open, while the buds are still forming.

Follow the label rate exactly: boron helps in a tiny dose but harms the tree if overdone, so never guess or double up.

Spray in the cool of the day, wetting the leaves evenly.

Spray safely: cover skin, eyes and nose, keep it off food, keep children and animals away, and wash your hands afterwards.

Walk the flowering trees about once a week through the 2–3 months of bloom.

Heat stress: in hot, dry, windy spells look for flowers and pin-head fruitlets shrivelling and dropping. Keep the soil moist and, where you can, shelter the trees from wind — steady water carries them through the heat.

Thrips: look for tiny slender insects, under 2 mm long, in the flowers and on the youngest leaves — tap a flower over a dark cloth and watch for specks that crawl. On set fruitlets they leave silvery streaks and rough brown scarring on the skin.

Write down what you see. If thrips are building in the flowers or scarring young fruit, open the thrips guide — but remember, do not spray insecticide on open bloom (it kills bees); use bee-safe options and timing.

Keep the soil evenly moist across the whole long fruit-growing period — no long dry spells, no sudden floods.

Water every 7–14 days, adjusting for the weather and soil: more often in hot, dry, windy weather and on sandy soil.

Soak deeply each time to wet the whole root zone out to the branch tips, then let the top just begin to dry before the next watering — never leave the roots standing in water.

After a dry spell, do not suddenly flood a thirsty tree — ease the water back on, or the fast swing splits the fruit.

Start the potassium-focused feeding about a month after bloom, once the fruit has set, and keep it going through the fill (roughly every 2–3 months).

Use a potassium-rich fertiliser, split into several small feeds rather than one heavy load, so it is not washed away and the tree gets a steady supply.

Spread it in a ring under the canopy out to the branch tips, not against the trunk, and water it in.

Keep fertiliser off wet leaves, away from food, water and children, and wash your hands afterwards.

Walk the trees every 2–4 weeks (weekly if you are growing for export), checking fruit on the tree and any fruit on the ground.

Thrips: look for silvery streaks and rough brown scarring on the fruit skin — cosmetic damage that downgrades fresh and export fruit.

False codling moth: look for a small entry hole ringed with sawdust-like droppings, and a single fruit colouring early and dropping; cut a suspect fruit open and you will find a pinkish caterpillar and tunnelling inside.

Fruit fly: look for tiny sting punctures that ooze sap and darken, soft rotting patches, and fruit dropping early; cut it open and there are small maggots inside.

Sanitation is your main weapon: collect and destroy every fallen and stung fruit (bury it deep or seal it in a bag in the sun) at least weekly — this breaks the pests' breeding cycle. Hang scent traps (pheromone or food-bait traps that lure and catch the moths and flies) to know when numbers rise, then open the matching pest guide to act.

Wait until the fruit is at full size and the skin is just starting to change — losing its bright gloss, and (on dark varieties like Hass) beginning to turn from green toward a darker shade.

Test-ripen a few sample fruit: pick 3–4 fruit, leave them at room temperature, and watch for 4–10 days. Mature fruit softens smoothly and evenly into good eating; immature fruit shrivels, stays rubbery, or never softens.

Once the samples ripen well, start picking. Cut each fruit off with clippers (never pull it), leaving a short stalk button on the fruit, and lower it gently — never drop it.

Pick in several passes, every 2–3 weeks, taking the biggest, most-mature fruit each time. The rest can safely hang and keep sizing — avocado holds on the tree for weeks.

Handle every fruit like an egg: each knock becomes a bruise that shows only once the fruit ripens, and cuts its value.

If your sample fruit shrivels, stays rock-hard, or turns rubbery instead of softening smoothly → it is not mature yet. Leave the crop on the tree (it holds for weeks) and test another few fruit in 2–3 weeks.

The same day you pick, sort the fruit: set aside anything bruised, cut, stung, scarred or undersized for eating or local sale, and keep the clean, sound fruit for market or export.

Handle gently at every step — avocado bruises easily, and the bruise only shows once the fruit ripens.

Cool the fruit quickly — move it into shade and the coolest store you have, out of the sun and heat.

For export or distant markets, keep the fruit cool right through transport — steady cool from orchard to buyer (the cold chain) is what carries it through a long journey.