Light requirements
How much light does Eggplant / aubergine (Solanum melongena) need?
Also called aubergine, brinjal, melongene.
About Eggplant / aubergine
Solanum melongena · also called aubergine, brinjal · edible
Eggplant (US) or aubergine (UK) is a warm-season Solanum grown for glossy fruit in purple, white, or striped. Needs heat — fruit set drops below 21°C. Start indoors early and grow in a greenhouse or sunny sheltered spot in cool climates. Foliage is toxic to pets.
Solanum melongena was domesticated in tropical Asia (India/Bangladesh and the surrounding region) from the wild S. insanum; it is a tender, frost-intolerant warm-season perennial grown as an annual.
Full sun and sustained warmth; growth is fastest at 70–85F and stalls in cool weather, so transplant only once nights stay above 50F.
Comfort temperature: 21-29°C
Watch for — Pale undersized fruit: Under-feeding or root-bound in containers.
Sources: extension.umn.edu, hgic.clemson.edu, frontiersin.org
The exact light eggplant / aubergine needs
Eggplant / aubergine is a sun-driven crop — yield is directly limited by how much direct sun it gets, so this is one plant where "more light, more harvest" is literally true.
Put a number on it — this is what a meter (or a free phone light-meter app) should read where eggplant / aubergine sits:
- Footcandles: Outdoor full sun is ~5,000–10,000+ fc; far beyond anything a windowsill provides.
- Lux: Tens of thousands of lux in open sun — orders of magnitude more than typical indoor light.
- Duration: Target 6–8 hours of direct sun a day through the growing season.
In plain terms, Full sun outdoors: an open spot that gets 6–8 hours of unobstructed direct sun, ideally including midday. Indoors or on a windowsill it needs the brightest south-facing position you have and usually still benefits from a grow light. Shaded beds, north-facing walls, and gappy "dappled" light — these grow lush leaves but little or poor-quality crop.
Not sure how to read the light in your home? Our light meter guide walks through measuring footcandles and lux with a free phone app and turning the reading into a placement decision for eggplant / aubergine.
Signs eggplant / aubergine is getting too much light
The most exposed leaves show it first. For eggplant / aubergine specifically, watch for:
- In extreme heat plus intense sun, leaf scorch or sunscald on exposed fruit — usually a heat/water-stress combination rather than light alone; mulch and steady watering fix most of it.
- Wilting in the fiercest afternoon sun that recovers by evening — eggplant / aubergine is photosynthesising hard, not over-lit; keep it watered.
- Bolting (premature flowering) in leafy crops is triggered more by heat and daylength than raw light intensity.
Light damage does not heal — a scorched leaf stays scorched — so the fix is to move eggplant / aubergine out of the harsh light rather than wait for it to recover.
Signs eggplant / aubergine is not getting enough light
Too little light is slower and sneakier than too much. The classic tell is etiolation: the plant stretches and pales as it reaches for a window. For eggplant / aubergine, look for:
- Tall, pale, leggy, floppy eggplant / aubergine reaching for the light, with thin stems that flop — classic shade etiolation.
- Poor flowering and a small, late, disappointing or non-existent harvest — the clearest sign it is under-lit.
- Lush dark leaves but few fruit; soft growth that pests and disease find easily.
If eggplant / aubergine is stretched, leggy and pale, our guide to leggy, stretched plants covers how to fix it and whether it can be pruned back into shape. Tucking eggplant / aubergine into a part-shade corner and expecting a full crop. Leafy growth tolerates some shade, but fruit, roots and flavour are paid for in hours of direct sun — short the light and you short the harvest.
Where to put eggplant / aubergine: the best window and room
Give eggplant / aubergine the sunniest open ground or the largest container in the brightest spot you have. A south-facing wall, allotment in the open, or unshaded raised bed is ideal. If you are growing it indoors or on a balcony, a full-spectrum grow light is usually not optional but essential — a windowsill alone rarely ripens a sun crop well.
- Pick the sunniest position. Site eggplant / aubergine where it gets 6–8 hours of direct sun — open ground or the brightest container spot, away from walls and tree shade.
- Track the sun across the season. A spot sunny in May can be shaded by a leafed-out tree or low autumn sun later. Watch where the shadows actually fall before committing.
- Add a grow light indoors. Growing eggplant / aubergine inside or on a windowsill? Run a strong full-spectrum LED 12–16 hours a day — windowsill light alone rarely crops well.
- Mulch and water to handle the heat. Full sun comes with heat stress; mulch and consistent watering prevent the scorch and bolting that sun gets blamed for.
Does eggplant / aubergine need a grow light?
For indoor or windowsill growing, eggplant / aubergine almost always needs a grow light to crop properly: a strong full-spectrum LED run 12–16 hours a day, positioned close. Light is the single biggest limiting factor for a sun crop grown inside — soil and water can be perfect and it will still fail in dim light.
The seasonal light shift (why winter changes everything)
Eggplant / aubergine is a growing-season crop. Outdoors, plant it so its main growth lands in the long, high-sun months — light and warmth fall away fast from autumn. For year-round indoor growing you must replace the lost winter sun with a grow light on a timer; the natural window light from October to February is far too weak for cropping.
Light and watering are linked: a plant in weaker winter light photosynthesises and drinks far less, so the same routine that worked in summer can rot it. See how often to water eggplant / aubergine for the season-by-season schedule that pairs with this light plan.
Eggplant / aubergine light requirements — frequently asked questions
How much light does eggplant / aubergine need?
Eggplant / aubergine needs Outdoor full sun is ~5,000–10,000+ fc; far beyond anything a windowsill provides. Tens of thousands of lux in open sun — orders of magnitude more than typical indoor light. Full sun outdoors: an open spot that gets 6–8 hours of unobstructed direct sun, ideally including midday. Indoors or on a windowsill it needs the brightest south-facing position you have and usually still benefits from a grow light.
Can eggplant / aubergine survive in low light?
No, not really. Eggplant / aubergine is a sun lover — in low light it etiolates: it stretches, pales, weakens and slows right down. It will not instantly die, but it steadily declines and never looks its best.
What are the signs eggplant / aubergine is getting too much light?
In extreme heat plus intense sun, leaf scorch or sunscald on exposed fruit — usually a heat/water-stress combination rather than light alone; mulch and steady watering fix most of it. Wilting in the fiercest afternoon sun that recovers by evening — eggplant / aubergine is photosynthesising hard, not over-lit; keep it watered. Bolting (premature flowering) in leafy crops is triggered more by heat and daylength than raw light intensity. Tucking eggplant / aubergine into a part-shade corner and expecting a full crop. Leafy growth tolerates some shade, but fruit, roots and flavour are paid for in hours of direct sun — short the light and you short the harvest.
What are the signs eggplant / aubergine is not getting enough light?
Tall, pale, leggy, floppy eggplant / aubergine reaching for the light, with thin stems that flop — classic shade etiolation. Poor flowering and a small, late, disappointing or non-existent harvest — the clearest sign it is under-lit. Lush dark leaves but few fruit; soft growth that pests and disease find easily. If you see this, move eggplant / aubergine closer to the light or add a grow light — and check our guide on leggy, stretched plants.
Does eggplant / aubergine need a grow light?
For indoor or windowsill growing, eggplant / aubergine almost always needs a grow light to crop properly: a strong full-spectrum LED run 12–16 hours a day, positioned close. Light is the single biggest limiting factor for a sun crop grown inside — soil and water can be perfect and it will still fail in dim light.
Keep reading
- Eggplant / aubergine care — the full brief (light, water, soil, problems, pet safety)
- How often to water eggplant / aubergine — the watering schedule
- Light meter guide — measure footcandles and lux with a free phone app
- Leggy, stretched plants — why it happens and how to fix it
- Best low-light plants — what actually survives a dim room
- Plants for north-facing windows — what thrives with no direct sun
- How much light does tomato need?
- How much light does pepper need?
- How much light does cucumber need?
- Light requirements for all 200 species in the Growli library