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Aegle marmelos

Tree
Sow fresh seed in warm season
Full sun

Also known as: Bengal Quince · Bili · Golden Apple · Indian Bael · Stone Apple · Wood Apple

When & where

Season
Sow fresh seed in warm season
USDA zones
Zones 10–12; tropical/subtropical
Sun
Full sun
Start indoors
Start in warm conditions any time
Direct sow outdoors
After soil is warm and danger of frost has passed
Days to harvest
Fruit in 6–10 years from seed

Germination

Germination time
14–45 days
Soil temperature
75–90°F (24–32°C)

Spacing & depth

Sow depth
1/2–1 in (1–2.5 cm)
Seed spacing
Sow individually in deep pots
Mature plant spacing
Final: 20–30 ft (6–9 m)
Row spacing
N/A

How to plant

Sow fresh, cleaned seed in deep, well-drained pots in full sun and warmth. Keep evenly moist but not soggy. Transplant carefully because of the taproot.

Grower's tip

Sacred Indian tree with aromatic, hard-shelled fruit used for juice, preserves, and medicine. Needs a long frost-free growing season.

Woody plant facts

USDA zones
Zones 10–12; tropical/subtropical
Mature height
8–10 ft dwarf · 12–18 ft semi-dwarf · 20–30 ft standard
Mature spread
8–25 ft (2.4–7.6 m), matching the rootstock
Years to fruit
2–4 years dwarf · 4–8 years standard · 6–10 years from seed
Chill hours
500–1,000 for most; low-chill cultivars from 250
Pollination
Needs a second apple or crabapple in the same bloom group. Crabapples are excellent universal pollenizers.
Rootstock
M9/B9 dwarf (needs staking for life), M26 and G935 semi-dwarf, seedling for a full standard.
Planting depth for seed
Stratify pips 60–90 days, then sow 1/2 in (12 mm) deep.
Soil pH
6.0–7.0
Disease & problem notes
Scab, cedar-apple rust and fire blight. Pick a resistant cultivar, rake fallen leaves, and thin for airflow.

Soil preferences

Soil type

Deep, well-drained native soil. Avoid amending the planting hole heavily — roots should learn to grow into the surrounding earth.

pH range

5.5–7.5 depending on species (conifers lean acidic; most hardwoods neutral).

Amendments

Top-dress with compost and mulch in a wide ring; don't backfill with pure compost.

Watering

Frequency

Deep soak weekly the first two years while roots establish; taper once the tree self-supports.

Method

Slow trickle at the drip line, not the trunk. A 5-gal bucket with a pinhole is ideal.

Over vs. under

Overwatered: yellowing, root rot, mushroom collar. Underwatered: leaf scorch, early leaf drop.

Top-water or bottom-water?

Prefers top-watering — Trees are always top-watered — deep slow soak at the drip line, never at the trunk. Bottom-watering only makes sense for nursery seedlings.

Temperature tolerance

Ideal daytime air temp

Broad — most species tolerate 40–90°F once established

Ideal nighttime air temp

Down to species-rated USDA zone minimum

Frost sensitivity

Hardy once established; young seedlings need protection their first winter.

Special germination requirements

Most temperate tree seed needs cold stratification (30–120+ days at 34–41°F) — see each species entry for the exact time.

Container growing

Container-suitable?

Possible with the right cultivar

Recommended pot size

Deep tree pots (root trainers) for the first 1–2 seasons; permanent site required for full growth.

Notes

Only dwarf, patio, or bonsai forms live long-term in containers.

Detailed harvesting

Not applicable for ornamental/timber trees. Nut and fruit species — pick when they drop naturally.

Post-harvest storage & preservation

Nuts: keep damp and cool, sow promptly. Winged/coned seed: dry, cool, dark in a sealed jar.

Culinary, medicinal & other uses

Shade, windbreak, wildlife habitat, timber, ornament, and long-term carbon storage.

Medicinal or traditional uses are shared for interest only — this is not medical advice. Consult a qualified professional before using any plant medicinally.

Seed saving

Pollination

Wind- or insect-pollinated; seedlings rarely match the parent exactly (especially named cultivars — those must be grafted or cutting-grown).

Isolation needs

Not practical for trees. Expect variation.

How to save

Collect fully ripe seed in fall, clean, dry or keep damp per species, then cold-stratify before spring sowing.

Your zone's planting calendar

Pick your USDA hardiness zone and we'll estimate the key dates for aegle marmelos in your area. These are regional averages — always check your own last-frost forecast before sowing.

My Aegle marmelos notes

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