Pitch apple

Sun

Full sun to partial shade outdoors; bright light under glass. Acclimatise indoor plants gradually before exposing them to direct outdoor sun.

Water

Water regularly while establishing, then allow the surface soil to dry between waterings. Established trees tolerate short dry spells; container plants need less water in winter.

Soil

Well-drained soil, including sandy or limestone soils. Use a free-draining potting mix in containers and avoid persistently waterlogged ground.

Height

25-40 ft (7.6-12.2 m) outdoors; usually much smaller in containers

Spread

20-30 ft (6.1-9.1 m) outdoors

Flowers

Mainly spring and summer, sometimes intermittently in tropical climates; white flowers that may be flushed pink.

Foliage

Evergreen. Large, leathery, glossy green leaves in opposite pairs, with rounded tips. Scratches remain visible on the leaf surface, giving rise to the name autograph tree.

Growth

Moderate in warm conditions; slower indoors or in restricted containers.

Care needed

Medium

• Drought tolerant
• Heat tolerant
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Moderate

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   7 ft (2 m)

2. After 1 year

   8 ft (2.3 m)

3. After 2 years

   9 ft (2.6 m)

4. After 3 years

   10 ft (2.9 m)

5. After 5 years

   12 ft (3.5 m)

About 26 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Toxic

Native to

the US

Growth rate

Slow

• Plant only where frost is exceptional, with room for the mature canopy and spreading roots.
• Water deeply during establishment, letting the upper soil dry slightly before watering again.
• Apply a light dressing of balanced, slow-release fertiliser in spring if growth is weak or the plant is container-grown.
• Spread organic mulch over the root zone, keeping it clear of the trunk.
• Bring container plants under bright, warm cover before nights fall below 50°F (10°C).
• Keep pots out of standing water and check drainage holes regularly.

Pruning. Prune in spring or early summer, after cold weather has passed, to remove damaged growth and shorten unwanted branches. Start shaping young plants early; repeated hard clipping sacrifices flowers and creates a dense outer shell.

Spring

Plant outdoors once conditions are consistently warm, or repot container plants that have filled their pots.

Spring

Apply a light feed and renew mulch without covering the trunk base.

Early summer

Shape young trees or lightly trim screens, leaving enough space for light to reach lower branches.

Summer

Check container moisture frequently and inspect leaf undersides for scale and mealybugs.

Autumn

Move outdoor containers into bright shelter before cool nights arrive.

Winter

Reduce watering under cover, but do not let the entire root ball become bone dry.

• Use as a broad-canopied specimen in a large, frost-free courtyard, well away from paving, drains and buildings.
• Plant as a dense evergreen screen where there is room to maintain both its height and width.
• Combine with palms, philodendrons and bromeliads for contrasting leaf shapes in a tropical garden.
• Grow in a large container as a bold foliage accent on a warm patio, with winter shelter available in cooler climates.

Garden styles it suits: Modern tropical, Architectural minimal, Tropical, Coastal, Florida subtropical and Caribbean.

Plant it with: Lady palm, Bird of paradise, Philodendron, Bromeliads and Cast-iron plant.

Wildlife: The exposed seeds have colourful fleshy coverings that attract fruit-eating birds, which can disperse the plant beyond gardens.

• Scale insects and mealybugs: inspect stems and leaf undersides, remove small infestations by hand, and use a labelled horticultural oil or insecticidal soap if needed.
• Root rot from wet soil: improve drainage, empty saucers and let the upper potting mix dry before watering again.
• Cold damage: protect from frost and move containers into warm shelter before chilly weather; remove dead growth once new growth reveals the extent of damage.
• Leaf scorch after a sudden move outdoors: introduce direct sun gradually and provide temporary afternoon shade.

Treat the fruit, seeds and milky sap as toxic to people, cats and dogs. Chewing or swallowing them can cause mouth irritation, vomiting or diarrhoea, and sap can irritate skin and eyes. Horse-specific toxicity is not well documented; keep livestock away. Seek medical or veterinary advice after ingestion.

Where it spreads. Invasive in Hawaii and Sri Lanka, where bird-dispersed seedlings can establish in native vegetation and on other trees. Check local restrictions before planting in tropical regions, and remove unwanted seedlings promptly.

• Small-leaf clusia (Clusia guttifera)

  Usually has much smaller leaves and a compact, densely branched shrub habit; pitch apple develops larger, broader leaves and a substantial tree canopy.

• Rubber plant (Ficus elastica)

  Has alternate, usually pointed leaves and conspicuous sheaths around emerging leaves; pitch apple has opposite pairs of rounded leaves.

Clusia honours the botanist Carolus Clusius, rosea means rose-coloured, and pitch apple refers to the dark, sticky resin associated with the fruit.

Propagation. Take stem cuttings during warm weather and root them in a moist, free-draining medium with high humidity. Air layering is another option; fresh seed can also be used where growing the species is permitted.

Accepted botanical name

Clusia rosea

In the US and Canada

Native in the lower 48 states, Puerto Rico and US Virgin Islands. Introduced in Hawaii.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.