Eggplant — aubergine — is a warm-climate vegetable that rewards a sunny, sheltered garden with glossy, purple fruit through late summer. It is a close relative of tomatoes and peppers, and like them it needs warmth, a long season and a little patience.
Eggplant is the slowest of the three nightshades to get going, so start it early indoors and do not rush it outside.
Eggplant at a glance
| Growing factor | What eggplant need |
|---|---|
| Sun | full sun |
| Soil pH | 6.0–6.8 |
| Days to germination | 7–14 |
| Days to maturity | 70–85 |
| Spacing | 18–24 inches |
| Water needs | moderate |
| Cold tolerance | tender |
| Family | Solanaceae |
Starting seeds
This is a start-indoors crop: sow under cover in trays, cells or small pots of seed compost, keep the mix moist but not waterlogged, and expect germination in 7–14 days. Give seedlings strong light from the moment they emerge.
Work backwards from your last frost date to time your sowing, using our seed-starting calculator and the frost-date calculator. Zones 11–13 are frost-free, so there the calendar is about heat and rain instead — check your local extension service for sowing windows that fit your area.
Eggplant is started indoors, since it needs a long, warm season and is slow to germinate and grow. Sow in small pots of seed compost and keep them warm and bright — a propagator or a warm windowsill helps. Pot seedlings on into individual pots as they grow so they are strong, stocky plants by the time they go out.
Transplanting and planting out
Eggplant goes out only after all frost danger has passed and the soil is warm; like peppers, it sulks in cold soil and can sit without growing for weeks. Harden plants off over a week, then plant at their full spacing in the sunniest, most sheltered spot you have. A stake for each plant is worth adding at planting time, since fruit-laden plants get top-heavy.
Space plants 18–24 inches apart — crowding is one of the commonest causes of small harvests. Harden seedlings off for a week before planting out, and plant on a cloudy day or in the evening. Our plant-spacing calculator works out how many plants fit your bed.
Soil and feeding
Eggplant grow best in rich, well-drained soil with plenty of organic matter. Dig in compost before planting: it improves heavy soil, helps light soil hold moisture, and feeds the soil life that feeds your plants. Aim for a soil pH of 6.0–6.8 — a simple soil test will tell you where you stand, and garden lime or sulfur can nudge pH up or down over a season, so test before you amend rather than guessing.
Feed lightly and steadily rather than in one heavy dose: too much fast nitrogen late in the season pushes leafy growth at the expense of the part you eat. Our fertiliser calculator works out amounts for your bed size, and the soil-volume calculator tells you how much mix a new bed needs.
Watering
Water needs are moderate: keep the soil evenly moist, watering deeply when the top inch or two dries out. Deep, infrequent watering builds deeper roots than a daily sprinkle.
Water at the base of the plant, in the morning, so the leaves dry quickly and the water reaches the roots. Our watering calculator gives a starting point for your bed size, and the watering schedule generator can build a routine around it. A mulch layer cuts evaporation and keeps moisture even.
Sunlight and temperature
Eggplant need full sun — a spot that gets sun for most of the day. Our sunlight calculator can check your spot.
This crop is rated tender for cold tolerance, so frost will kill it: it needs warm soil and frost-free nights, and should only go outside once all danger of frost has passed. In Zones 11–13, which are frost-free, it can be grown for much of the year, though the hottest months may still stress it. Our hardiness-zone finder will confirm your zone, and the frost-date calculator gives you the frost dates to plan around.
Pests and diseases
The pests and diseases most often reported on eggplant are aphids, hornworms, flea beetles, whiteflies. Healthy, well-watered plants resist attack better than stressed ones, and rotating beds so the Solanaceae family does not repeat in the same spot helps keep soil-borne problems down.
- Aphids — small sap-sucking insects on new growth; wash off with a strong jet of water and encourage ladybirds.
- Hornworms — large green caterpillars that strip leaves fast; hand-pick them, looking for their droppings below.
- Flea Beetles — tiny jumping beetles that chew shot-holes in leaves, worst on seedlings; row cover keeps them off young plants.
- Whiteflies — tiny white insects that rise in a cloud when disturbed; yellow sticky traps help monitor them.
Inspect plants weekly, especially leaf undersides, and act early. Our pest-identifier helper can help identify what you are seeing.
Companion plants
Good companion plants for eggplant include:
- Marigolds — their roots discourage some soil pests
- Basil — attracts pollinators
- Onions — their scent is said to confuse pests
- Lettuce — shallow-rooted, fills gaps without competing
Our companion-planting finder can suggest more pairings for your bed plan.
Harvesting
Pick eggplant when the fruit is glossy, firm and fully coloured for its variety — dull skin or soft spots mean it is overmature and may be bitter inside. Cut fruit off with secateurs, leaving a short piece of stem, and handle gently since the skin bruises easily. Pick regularly and the plant keeps producing into autumn.
Expect the crop to be ready about 70–85 days after sowing, though weather and variety shift that window by a week or two either way. Our harvest-date calculator works out your expected harvest date from your sowing date, and the vegetable-yield estimator can estimate how much a bed should produce.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Seedlings full of tiny holes | flea beetles on young plants | Row cover over young plants keeps flea beetles off until the plants are bigger, and keeping the soil moist helps seedlings outgrow the damage. |
| Flowers dropping without setting fruit | heat stress or cold nights | Eggplant drops flowers in very hot weather or after a cold night. |
| Bitter fruit | fruit picked overmature or plants under stress | Pick fruit while the skin is glossy and the flesh is firm, and keep plants evenly watered. |
Seedlings full of tiny holes
Row cover over young plants keeps flea beetles off until the plants are bigger, and keeping the soil moist helps seedlings outgrow the damage.
Flowers dropping without setting fruit
Eggplant drops flowers in very hot weather or after a cold night.
Bitter fruit
Pick fruit while the skin is glossy and the flesh is firm, and keep plants evenly watered.
Frequently asked questions
When should I plant eggplant?
Start seeds indoors before your last frost and plant out only after all frost danger has passed, since this is a tender crop. For zone-specific timing, see zone 5 or zone 7, and check your local extension service for the dates that fit your area.
How long do eggplant take to grow?
Eggplant take 70–85 days from sowing to maturity, and seed germinates in 7–14 days. Weather and variety shift the harvest window by a week or two, so judge readiness by look and feel rather than the calendar alone.
How far apart should I plant eggplant?
Space plants 18–24 inches apart — that is the room a mature plant needs, and crowding means poor airflow and small harvests. Our plant-spacing calculator works out how many fit your bed.
Can I grow eggplant in a pot?
Yes — eggplant does very well in a large pot in a sunny, sheltered spot, and pots warm up faster than garden soil, which this heat-loving plant appreciates. Use a big pot, rich compost, a stake for support and water regularly, since pots dry out fast.