Atis (Annona squamosa)

About Atis

Atis (sugar apple or sweetsop) is one of the most beloved native-adopted fruits in the Philippines — a small deciduous tree that rewards patient growers with intensely sweet, custard-textured fruit unlike anything else in the tropical world. Scientifically classified as Annona squamosa, it belongs to the Annonaceae (custard apple) family, which also includes its larger cousin guyabano (Annona muricata).

The tree grows 3 to 5 meters tall with an open, irregular canopy of large, oblong leaves that emit a mildly spicy fragrance when crushed. The fruit is distinctive — round to heart-shaped, 7 to 10 centimeters in diameter, covered with bumpy, knob-like segments that give it the appearance of a green pine cone. When ripe, these segments separate slightly, revealing creamy white flesh inside.

The eating experience of ripe atis is unique: the fruit is pulled apart by hand, and each segment contains a dollop of soft, granular-smooth white pulp surrounding a hard black seed. The flavor is intensely sweet — often compared to vanilla custard with hints of pear and pineapple — with sugar content reaching 15 to 20 percent. Atis is predominantly eaten fresh, as the delicate flesh does not transport or store well, making backyard-grown atis a rare luxury that supermarket fruit cannot match.

History & Discovery

Annona squamosa originated in the tropical Americas — likely in the lowlands of Central America and the Caribbean. Spanish colonizers brought the fruit to the Philippines during the galleon trade era, and it naturalized quickly in the Philippine climate. The Tagalog name "atis" is believed to derive from the Spanish name for the fruit.

The genus Annona was described by Linnaeus in 1753, with the species name "squamosa" referring to the scaly (squamous) appearance of the fruit surface. By the 19th century, atis had become thoroughly integrated into Philippine village life — trees grew in nearly every rural compound, and the fruit was a cherished seasonal treat. Today, atis remains more of a backyard fruit than a commercial crop in the Philippines, though improved varieties and grafting techniques are gradually expanding its market presence.

In Philippine folk medicine, various parts of the atis tree have traditional uses: crushed seeds as an insecticide, leaf decoctions for skin conditions, and bark infusions for diarrhea. However, these uses involve parts of the plant that contain toxic annonacin, so they require caution and are not DOH-approved.

How to Plant Atis in the Philippines

Atis can be grown from seed (easy but slow) or from grafted seedlings (faster fruiting, improved variety traits).

1. Obtain seeds or seedlings. Extract black seeds from ripe atis and dry for 2 to 3 days. Scarify lightly with sandpaper to speed germination. Alternatively, purchase grafted seedlings from a nursery — these fruit 1 to 2 years faster.
2. Sow seeds. Plant 2 centimeters deep in seedling trays with well-draining mix. Keep moist and warm. Germination is slow — 20 to 30 days or longer. Be patient.
3. Prepare the planting site. Choose a full-sun, well-draining location. Dig a hole 50 centimeters wide and deep. Mix soil with 5 kilograms of compost. Atis is drought-tolerant and prefers a distinct dry season to trigger flowering — avoid chronically waterlogged sites.
4. Transplant. When seedlings are 30 to 40 centimeters tall (6 to 12 months), transplant to the prepared hole. Space trees 4 to 5 meters apart. Water deeply and mulch.
5. Hand-pollinate for better fruit set. Atis flowers are poorly pollinated naturally. Use a small paintbrush in the early morning to transfer pollen from mature flowers to newly opened ones. This can increase fruit set from 5 to 10 percent to 60 to 80 percent.
6. Harvest. Seed-grown trees fruit in 3 to 4 years; grafted trees in 2 to 3 years. Harvest when fruit turns pale green and segments begin separating slightly. Ripen at room temperature for 1 to 2 days.

Care Guide

Sunlight

Atis requires full sun — 6 to 8 hours of direct sunlight daily. The tree performs best in open locations away from competing shade trees. Insufficient light leads to poor flowering and fruit set. In Metro Manila, south- or west-facing positions provide the strongest sun exposure.

Watering

Water deeply every 3 to 5 days during the dry season for young trees. Established atis (3+ years) is notably drought-tolerant — in fact, a dry period is beneficial as it triggers leaf drop, dormancy, and subsequent flowering. Overwatering during the flowering period can cause flower drop and reduced fruit set. During the rainy season, ensure drainage to prevent root rot.

Soil

Atis adapts to a range of soils but performs best in well-draining sandy loam or loam with a pH of 5.5 to 7.5. It tolerates slightly alkaline conditions better than many tropical fruit trees. Good drainage is essential — the tree's roots are susceptible to rot in heavy, waterlogged clay. Amend planting holes with compost and coarse sand for best results.

Humidity & Temperature

Atis thrives at 25°C to 38°C and actually prefers slightly drier conditions than many Philippine fruit trees. The tree benefits from a distinct dry season (which the Philippines naturally provides from November to May), as drought stress triggers leaf drop and the flush of new growth that produces flowers. Excessive humidity during flowering promotes fungal diseases on blossoms.

Fertilizer

Apply balanced fertilizer (14-14-14) at 200 to 300 grams per tree every 3 months. Before flowering season, shift to phosphorus and potassium-rich fertilizer (e.g., 0-18-18 or bone meal) to promote flower development and fruit set. Top-dress with compost annually. Young trees benefit from monthly applications of urea for canopy development.

Pruning

Prune annually after harvest to maintain an open canopy shape. Remove dead, crossing, and inward-growing branches. Tip-prune new growth to encourage lateral branching and more flowering sites. Atis fruits on new growth, so strategic pruning stimulates the production of fruiting shoots. Keep the tree to 3 to 4 meters for easier hand pollination and harvesting.

Growing Medium Options

Edible Uses & Nutrition

Atis is primarily eaten fresh — the delicate flesh does not lend itself to cooking or extensive processing.

Culinary Uses

• Fresh eating. The classic preparation — break apart the ripe fruit by hand and eat the white pulp directly from each segment, spitting out the seeds. Best chilled on a hot afternoon.
• Atis ice cream and sorbet. The pulp is sieved to remove seeds and churned into ice cream — a Filipino-artisanal favorite with an incomparably creamy flavor.
• Atis shake. Pulp blended with milk, sugar, and ice for a rich, custard-like smoothie.
• Fruit salad. Scooped pulp added to mixed fruit salads and halo-halo for extra sweetness.
• Atis jam. Pulp cooked with sugar and calamansi juice to make a fragrant preserve — less common but excellent on pan de sal.

Nutritional Profile

Atis is a good source of vitamin C, dietary fiber, and B vitamins. The high natural sugar content makes it an excellent energy fruit, while the fiber content supports digestive health. The creamy texture comes from the fruit's relatively high carbohydrate and natural sugar content compared to other tropical fruits.

Air Quality & Oxygen

Atis is a small to medium-sized tree that provides moderate shade and oxygen production. Its open canopy allows dappled light through, making it a good companion tree that does not heavily shade neighboring plants. A mature atis tree (3 to 5 meters) offers pleasant shade for outdoor seating areas.

The tree is semi-deciduous in the Philippine dry season — dropping its leaves during the hottest months, which allows more sunlight to reach the ground when heat is greatest. New foliage emerges with the rains, providing shade during the humid wet season when cooling is most needed. This natural rhythm makes atis a thoughtful landscape tree for energy-conscious urban settings.

Toxicity & Safety

The key safety rule with atis: enjoy the flesh freely, but never consume crushed seeds. Filipino folk practice of using crushed atis seeds as a lice treatment carries toxicity risks and is not recommended by health authorities.

Common Pests & Diseases in the Philippines

• Mealybugs. White cottony masses on fruit surface and leaf joints — the most common atis pest. They excrete honeydew that attracts sooty mold. Spray with neem oil or insecticidal soap. Ant control also helps, as ants farm mealybugs.
• Fruit borers. Moth larvae that tunnel into developing fruit. Bag fruit with paper or cloth bags when small. Remove and destroy infested fruit.
• Anthracnose (Colletotrichum spp.). Dark spots and rot on ripening fruit during wet weather. Ensure good air circulation through pruning. Apply copper-based fungicide preventively.
• Scale insects. Small, immobile brown bumps on branches and leaves. Apply horticultural oil spray during the dormant period. Heavy infestations cause branch dieback.
• Fruit splitting. Not a pest but a physiological issue — sudden heavy rain after a dry period causes ripe fruit to split open. Harvest promptly when fruit begins to mature, especially in the early rainy season transition.

Frequently Asked Questions

Sources & References

• Plants of the World Online — Annona squamosa L. Royal Botanic Gardens, Kew. powo.science.kew.org
• Stuart, G.U. (2024). Philippine Medicinal Plants — Atis. stuartxchange.org
• USDA FoodData Central — Sugar-apples (sweetsop), raw. fdc.nal.usda.gov
• Pinto, A.C.Q. et al. (2005). Annona Species. International Centre for Underutilised Crops, University of Southampton.