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Plant care

Star Apple (Caimito) care

Chrysophyllum cainito

Also called Star apple, Caimito, Milk fruit.

RHS H1bUSDA 10-11Mildly toxic to petsIndoor 8-20 m in the open tropics

Watering rhythm

4-7days

When the top few centimetres of soil dry out, around every 4-7 days in active growth

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Light

Direct sun (at least 4-6 hours)

Soil

Deep, rich, free-draining loam

Humidity

60-85%

Temp

22-32°C

Pet safety

Mildly toxic to pets

Mature size

8-20 m in the open tropics

Care at a glance

Light

Most houseplants will scorch where star apple thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun produces the best growth, leaf colour and fruiting; aim for at least 6 hours of direct light. Young trees tolerate partial shade, but heavy shade reduces flowering and yield. Indoors, place in the brightest possible spot. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for when the top few centimetres of soil dry out, around every 4-7 days in active growth for star apple, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Keep consistently moist during the growing season and fruit development, allowing the surface to dry slightly between waterings. Mature trees tolerate brief dry spells but crop best with steady moisture. Reduce watering in cool weather to avoid soggy roots.

Soil and pot

Star Apple grows best in deep, rich, free-draining loam. Adaptable to sandy, loamy or limestone soils with a pH around 5.5-7.5, but rewards deep, fertile, well-drained ground. Improve poor or heavy soils with organic matter and ensure sharp drainage; use a loam-based, free-draining mix in containers. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Star Apple sits happiest at around 60-85% humidity and 22-32°C (72-90°F). A true lowland tropical that prefers warm, humid air. In dry indoor or greenhouse conditions raise humidity by grouping plants, using a pebble tray or misting; low humidity can cause leaf-tip browning. If you keep the room above 22 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed star apple sparingly. Feed young trees lightly every 1-2 months with a balanced fertiliser to drive growth. Switch bearing trees to a balanced or slightly higher-potassium feed several times during the warm season. Include micronutrients on alkaline soils to prevent chlorosis; withhold feed in winter. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on star apple in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Cold and frost sensitivity — Very tender; foliage is damaged near 0°C and young trees can be killed by frost. Provide overhead protection or move containers into a frost-free space in winter.
  • Astringent unripe fruit — Picked too early, the fruit is gummy and mouth-puckering from latex and tannins. Harvest only when fully coloured and slightly soft for sweet, milky pulp.
  • Scale, mealybugs and aphids — Sap-sucking pests cluster on new growth and undersides of leaves, causing sticky honeydew and sooty mould. Treat with horticultural oil or insecticidal soap.
  • Leaf-tip browning in dry air — Low indoor humidity and inconsistent watering scorch leaf edges. Maintain humidity and even moisture, especially for greenhouse and container plants.

Propagation

Commonly grown from fresh seed, which germinates readily in warm, humid conditions, though seedlings vary and are slow to fruit. Superior cultivars are propagated by grafting or air-layering for earlier, truer bearing. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Star Apple is mildly toxic to pets. Chrysophyllum cainito is not individually listed by the ASPCA, so its pet status is uncertain. The skin, rind and unripe flesh contain bitter latex and astringent tannins that are inedible and can irritate the mouth and gut; only the ripe inner pulp is eaten. Treat as potentially harmful to pets and verify with a vet before allowing access. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Star Apple care — frequently asked questions

What is the common name for Chrysophyllum cainito?

Chrysophyllum cainito is most commonly called Star Apple, but it is also known as Star apple, Caimito, Milk fruit. The names refer to the same species, so care instructions for Star Apple apply identically to anything sold as Caimito.

How much light does star apple need?

Star Apple grows best in direct sun (at least 4-6 hours). Full sun produces the best growth, leaf colour and fruiting; aim for at least 6 hours of direct light. Young trees tolerate partial shade, but heavy shade reduces flowering and yield. Indoors, place in the brightest possible spot.

How often should I water star apple?

Water star apple when the top few centimetres of soil dry out, around every 4-7 days in active growth. Keep consistently moist during the growing season and fruit development, allowing the surface to dry slightly between waterings. Mature trees tolerate brief dry spells but crop best with steady moisture. Reduce watering in cool weather to avoid soggy roots. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is star apple toxic to cats and dogs?

Star Apple is mildly toxic to pets. Chrysophyllum cainito is not individually listed by the ASPCA, so its pet status is uncertain. The skin, rind and unripe flesh contain bitter latex and astringent tannins that are inedible and can irritate the mouth and gut; only the ripe inner pulp is eaten. Treat as potentially harmful to pets and verify with a vet before allowing access.

What USDA hardiness zone does star apple grow in?

Star Apple is rated for USDA zone 10-11 (greenhouse/indoor elsewhere) and RHS hardiness H1b. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Star Apple deep-dive guides

Every aspect of star apple care, each with its own calibrated guide:

Featured in these plant shortlists

Star Apple qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Star Apple is also known as Star apple, Caimito, and Milk fruit.