Custard Apple (Bullock's Heart) care

Light

Aim for at least 4-6 hours of direct sun on the leaves. Requires at least 6–8 hours of direct sun daily for healthy growth and reliable fruiting. Best in an open, unshaded position. Insufficient light results in poor flower set and greatly reduced yield. In containers, place on a south-facing patio or in a heated glasshouse in full sun. If your only bright window faces south, that's perfect for custard apple — same window any aroid would fry on.

Watering

Watering custard apple: twice weekly when establishing; weekly once mature, reducing in dry dormancy. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Water regularly to maintain evenly moist but not waterlogged soil during active growth. Annona reticulata is somewhat drought-tolerant once established but benefits from irrigation during dry spells. Allow some drying between waterings. The tree is semi-deciduous and naturally reduces water needs in the dry season.

Soil and pot

Custard Apple grows best in well-drained sandy loam, slightly acidic to neutral. Thrives in well-drained, fertile sandy loam or loamy soil with a pH of 6.0–7.0. Does not tolerate waterlogged or heavy clay soils. Raised beds or mounded planting improves drainage in heavier soils. Mix in organic compost at planting. 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

Custard Apple sits happiest at around 60–85% humidity and 18–35°C (64–95°F). Prefers warm, humid tropical and subtropical conditions. In lower-humidity climates, mist foliage or use a humidifier if growing under glass. Low humidity can increase susceptibility to spider mites and reduce fruit set. If you keep the room above 18–35°C 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 custard apple sparingly. Apply a balanced slow-release fertiliser (NPK 8-3-9 or similar) three times per year in spring, early summer, and late summer. Once fruiting, increase potassium feeds to promote flavour. Avoid high-nitrogen feeds that stimulate leaf growth at the expense of flowers. 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 custard apple in the Growli community. Each is annotated with the most common cause so you know where to start.

• Fruit cracking — Irregular watering — dry spells followed by heavy irrigation — causes rapid expansion of the fruit, leading to skin splitting. Maintain consistent soil moisture as fruits approach maturity.
• Anthracnose (Colletotrichum sp.) — Dark, sunken lesions on leaves and fruit in humid conditions. Prune to improve airflow, remove infected material, and apply copper-based fungicide if the problem persists during wet seasons.
• Mealybugs — White cottony clusters appear at leaf axils and on young stems in warm conditions. Treat with neem oil spray or dilute insecticidal soap; repeat weekly for 3–4 applications.

Propagation

Primarily from seed, which germinates in 4–6 weeks when sown fresh at 24–28°C. Grafting onto Annona squamosa rootstock produces more vigorous, earlier-fruiting trees. Air-layering is also practised to maintain cultivar characteristics. 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

Custard Apple is mildly toxic to pets. All Annona species, including A. reticulata, contain annonaceous acetogenins — compounds concentrated in the seeds, bark, leaves, and unripe fruit. These have documented neurotoxic properties linked to atypical Parkinsonism with repeated high-level exposure. Seeds are particularly toxic. Annona is listed as toxic to dogs by veterinary toxicologists. The ASPCA does not specifically list this species, but caution is warranted for all pets. Ripe fruit flesh consumed in moderation is traditional food, but keep seeds and plant parts away from dogs and cats. 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.

Custard Apple deep-dive guides

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

• Common custard apple problems & fixes
• Custard Apple watering schedule
• Custard Apple light requirements
• Best soil mix for custard apple
• Custard Apple fertilizing guide
• When to repot custard apple
• How to propagate custard apple
• How to prune custard apple
• What's eating my custard apple?
• Custard Apple growth rate & size
• Custard Apple cold hardiness
• Custard Apple temperature & humidity
• Is custard apple toxic to cats & dogs?
• Is custard apple toxic to cats?
• Is custard apple toxic to dogs?
• All 10 Annona varieties

Featured in these plant shortlists

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

• Best drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Custard Apple is also known as Custard Apple, Bullock's Heart, Ox Heart, and Red Custard Apple.

• Nepenthes clipeata care — light, water and common problems
• Nepenthes macrophylla care — light, water and common problems
• Nepenthes edwardsiana care — light, water and common problems
• All 8452 plant care guides in the Growli library