Soursop (Guanábana) care

Light

Most houseplants will scorch where soursop thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun to very bright light for best fruiting; tolerates light partial shade. Indoors or under glass, give it the brightest position available and supplement with grow lights if needed. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for keep evenly moist; water when the top 2-3 cm of soil dries for soursop, 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. As a true tropical it likes steady moisture and dislikes drying out, yet still needs free drainage. Reduce watering slightly in cooler months but never let it stay bone dry or waterlogged.

Soil and pot

Soursop grows best in rich, well-drained loam. Prefers fertile, deep, well-drained soil, pH 5.0-6.5, with plenty of organic matter. Sensitive to waterlogging and to cold, saline or compacted soils. 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

Soursop sits happiest at around 60-80% humidity and 20-30°C (68-86°F). A genuinely tropical tree that thrives in warm, humid air. Low humidity stresses foliage and reduces fruit set, so under glass keep humidity high and air moving gently. If you keep the room above 20 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 soursop sparingly. Feed regularly through the warm season with a balanced fertiliser; young trees respond to little-and-often feeding. Maintain consistent nutrition, as soursop is a relatively fast grower when warm. 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 soursop in the Growli community. Each is annotated with the most common cause so you know where to start.

• Cold damage — The most cold-sensitive common Annona; chilling below about 5°C damages leaves and growth, and any frost can be fatal. Keep it reliably warm.
• Poor fruit set — Flowers often need hand pollination, as natural pollinators are scarce outside the tropics and the blooms self-pollinate poorly.
• Mealybugs and scale — Soft sap-suckers cluster on shoots and fruit, especially under glass. Inspect regularly and treat early with horticultural oil or insecticidal soap.
• Root rot — Despite loving moisture, it rots in waterlogged or poorly drained soil. Use rich but free-draining media and never let pots stand in water.

Propagation

Grown from fresh seed, which germinates readily in warmth and fruits in 3-5 years, or grafted to preserve superior fruit types. Cuttings and air-layering are possible but less reliable. 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

Soursop is mildly toxic to pets. Soursop is not individually listed by the ASPCA, so treat it with caution and verify with a vet. Annona muricata seeds and leaves are rich in annonaceous acetogenins, neurotoxic compounds, and the seeds are recognised as poisonous and irritant. Keep seeds, leaves and skin away from pets; only the ripe pulp is consumed, and seeds must be removed. 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.

Soursop deep-dive guides

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

• Soursop watering schedule
• Soursop light requirements
• Best soil mix for soursop
• Soursop fertilizing guide
• When to repot soursop
• How to propagate soursop
• Soursop growth rate & size
• Soursop cold hardiness
• Soursop temperature & humidity
• Is soursop toxic to cats & dogs?
• Is soursop toxic to cats?
• Is soursop toxic to dogs?

Featured in these plant shortlists

Soursop 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

Soursop is also known as Soursop, Guanábana, and Graviola.

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• All 5561 plant care guides in the Growli library