How to Grow Black Sapote
Diospyros nigra
Black sapote is the famous chocolate pudding fruit and one of the most rewarding tropical trees to grow in a UK heated greenhouse. Give it the brightest position available and keep compost evenly moist during the growing season. It is more cold-tolerant than mamey sapote, needing a minimum of 10°C year-round. Feed fortnightly from spring to autumn and switch to a high-potash feed from flowering. Fruit takes several months to develop and turns nearly black when ripe.
Yearly Lifecycle
Care Essentials
Feed fortnightly with a balanced liquid fertiliser from spring to autumn. Black sapote is a vigorous grower when warm and benefits from steady nutrition during the growing season.
Watch For
- Scale insects (sticky honeydew, bumps on stems)
- Mealybug (white cottony masses in leaf axils)
- Red spider mite (fine webbing in dry conditions)
- Root rot from overwatering (yellowing, wilting)
- Sooty mould (secondary to pest infestations)
Care Requirements
Light
Full sun, brightest position in heated greenhouse
Full sun in the brightest position available. A heated greenhouse or large conservatory is essential. Black sapote needs strong, consistent light to flower and fruit well.
Watering
Evenly moist in summer, reduced but not dry in cooler months
Water freely during the growing season, keeping compost evenly moist. Reduce in cooler months but do not allow the rootball to dry out completely. Black sapote tolerates brief dry spells better than mamey sapote.
Fertilizing
Balanced liquid feed fortnightly, high-potash from flowering
Feed fortnightly with a balanced liquid fertiliser from spring to autumn. Switch to a high-potash feed once flowering begins to support fruit development.
Pruning
Light pruning after harvest, tip prune for compact shape
Prune lightly after harvest to maintain shape and remove dead or crossing branches. Black sapote responds well to tip pruning to keep it compact in a container.
Overwintering
Heated glass essential, minimum 10°C year-round
Requires a heated greenhouse with a minimum temperature of 10°C. Black sapote is frost-tender and will suffer damage below 5°C. More cold-tolerant than mamey sapote but still needs protection.
Growing Tips
Warmth and light are essential
Provide the brightest position in a heated greenhouse. Black sapote needs strong light and a minimum of 10°C year-round to flower and set fruit reliably.
Consistent moisture
Keep compost evenly moist during the growing season. Reduce in cooler months but do not allow the rootball to dry out completely.
Monitor greenhouse pests
Watch for scale insects, mealybug, and red spider mite under glass. Introduce biological controls early before populations build up.
Wait for the skin to blacken
Fruit is ripe when the skin turns from bright green to very dark brown or black and yields to gentle pressure. Do not harvest early — unripe fruit is astringent and unpleasant.
Pests & Diseases
Pest Scale Insects
Identification: Small brown or white bumps on stems and leaf undersides, sticky honeydew and sooty mould
- Wipe off with a cloth dipped in soapy water
- Introduce parasitic wasps as biological control under glass
- Spray with plant oil-based insecticide
Pest Mealybug
Identification: White cottony masses in leaf axils and on stems, sticky honeydew
- Dab with a cotton bud soaked in methylated spirit
- Introduce Cryptolaemus ladybird as biological control
- Spray with fatty acid or plant oil-based insecticide
Pest Red Spider Mite
Identification: Fine webbing on leaf undersides, stippled yellowing leaves, tiny mites visible with a hand lens
- Increase humidity by misting regularly
- Introduce predatory mite Phytoseiulus persimilis
- Spray with fatty acid-based miticide
Disease Root Rot Phytophthora spp.
Symptoms: Yellowing leaves, wilting despite moist soil, dark mushy roots, plant collapse
Treatment: Remove from pot, trim rotten roots, repot in fresh free-draining compost. Reduce watering
Prevention: Use well-drained compost. Ensure pots have adequate drainage holes
Disease Sooty Mould
Symptoms: Black powdery coating on leaves and stems, growing on honeydew from sap-sucking insects
Treatment: Wipe off with a damp cloth. Control the underlying pest problem
Prevention: Monitor for and control sap-sucking pests promptly
Spacing & Planting
| Plant spacing | 800 cm |
| Row spacing | 900 cm |
| Mature height | 800 cm |
| Mature spread | 600 cm |
Large evergreen tropical tree related to persimmon. Green fruit turns nearly black when ripe, with dark chocolate-flavoured pulp. Needs a heated greenhouse in the UK.
