Vegetable · Solanaceae
Eggplant
Solanum melongena
Give it heat, full sun, and steady water, and eggplant rewards you with glossy fruit all season.
Full sun
Every 3–7 days
61–90°F · 16–32°C
65–80 days
Overview
Eggplant is a heat-loving nightshade grown for its glossy, meaty fruit. It traces back to South and East Asia and has been cooked across the world for centuries, from Italian parmigiana to Japanese grilled nasu. Gardeners often call it aubergine or brinjal, and it shares a family with tomatoes, peppers, and potatoes.
Of all the warm-season vegetables, eggplant asks the most patience. It needs a long, warm run to crop well, which is why most gardeners start it indoors and set it out only after the nights turn dependable. Give it that warmth and it keeps setting fruit until the cold returns.
The fruit comes in more shapes than the supermarket suggests. There are the big purple-black ovals, slim Asian types, and even white-skinned varieties. Pick early while the skin still shines and the flavor stays sweet rather than bitter.
Care
The short version: full sun and warm soil, with steady, even moisture of about an inch of water a week. Plant in rich, well drained ground, go easy on the nitrogen, and harvest while the skin is still glossy.
Light
Eggplant wants full sun, the more direct hours the better. It tolerates no real shade, and a plant kept in dim conditions grows leggy and sets little fruit.
Water
Aim for steady, even moisture rather than a drought followed by a flood, which works out to about an inch of water a week. Uneven watering turns the fruit bitter and cuts your yield. Water at the base and keep it off the leaves to hold disease down.
Soil
Plant in fertile, well drained loam with plenty of organic matter worked in. Eggplant is easygoing about pH, taking anything from 5.5 to 7.5, so most decent garden soil suits it.
Temperature
This is a true warm-season crop, happiest between 61°F and 90°F (16°C to 32°C). Cold checks its growth hard, and nights below 50°F (10°C) will make the flowers drop without setting fruit.
Humidity
Ordinary outdoor humidity is fine, so there's no number to chase. Good airflow matters more, since crowded, damp foliage is how fungal trouble takes hold.
Feeding
Side-dress with a nitrogen source such as calcium nitrate three to four weeks after planting, then again later in the season. Go easy on the nitrogen, since too much grows a leafy plant that delays fruiting.
Pruning
Eggplant rarely needs pruning. Pull off any damaged or diseased leaves, and stake or cage the taller, heavily fruiting plants so the fruit stays off the ground.
Size & spacing
Plants reach 2 to 4 feet (60 to 120 cm) tall and spread 18 to 30 inches (45 to 75 cm) across. Give each one room so air moves freely and the fruit hangs clear of the soil.
When to plant
Eggplant runs on heat and has no tolerance for cold. Start the seeds indoors about 8 weeks before your last frost, set the plants out only once nights hold above 50°F (10°C), and pick fruit from midsummer onward, roughly 65 to 80 days after transplanting.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Sow: About 8 weeks before the last spring frost
- Plant: After all danger of frost, when nighttime temperatures stay consistently above 50°F (10°C)
- Harvest: Harvest 65 to 80 days after transplanting, when fruit is large, glossy, and uniformly colored
Hardiness
USDA hardiness zones: 4–12
Temperature: down to -34°C
Troubleshooting
Most eggplant trouble shows up on the leaves or the fruit, and the warm, humid weather it loves is the same weather pests and disease love. Catch the early signs and you can step in before a small problem spreads. Match what you see below, then act while it still helps.
Plant wilting and yellowing with brown streaks inside the stem
This is verticillium wilt, a soilborne fungus that clogs the plant from the inside and gets worse as fruit forms. Cut a stem near the base and you will see brown streaking through the tissue, which confirms it. There is no cure, so pull and destroy badly affected plants, never compost them, and rotate eggplant away from tomato, pepper, and potato for several years.
Fix:
- Remove and destroy severely affected plants
- Do not compost infected material
Tiny round holes peppering young leaves
Those pinholes are the work of flea beetles, small dark insects that jump when you disturb them and swarm tender transplants. Cover young plants with floating row covers before the beetles find them, and keep nearby weeds down since they host the pest. A vigorous, well-fed plant usually outgrows the early damage on its own.
Fix:
- Use floating row covers on young plants
- Apply labeled insecticides if infestations are heavy
- Keep plants vigorous so they outgrow early damage
Flowers forming but dropping before any fruit sets
Eggplant is fussy about temperature, and blossom drop follows nights below 60°F (16°C), spells of extreme heat, or too much nitrogen pushing leafy growth at the expense of fruit. Watch for cold or hot snaps around flowering and for a lush plant carrying few blossoms. Set transplants out only once nights stay warm, and feed by soil-test rates rather than guessing.
Fix:
- Transplant only after nights stay warm
- Avoid over-fertilizing with nitrogen
Fruit turning bitter on the plate
Bitter fruit comes from uneven soil moisture or from leaving the eggplant on the plant too long. Pick while the skin is still glossy, and keep the moisture steady with mulch and regular watering. Fruit that has gone dull and seedy past its prime rarely tastes good no matter how you cook it.
Fix:
- Maintain even soil moisture
- Harvest fruit while skin is still glossy
Toxicity
The ripe, cooked fruit is good to eat, but the rest of the plant is not. Leaves, stems, and unripe green parts hold a natural compound called solanine that upsets the stomach, and it is mildly toxic to cats, dogs, horses, and other animals if the foliage is eaten. Keep the green parts away from pets and curious children.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds
Safe for
People
Cats Mild
A cat that nibbles the leaves or stems may drool, vomit, or get loose stools from the solanine they carry. The fruit is not the worry here, the foliage is.
Dogs Mild
Chewing on the green parts can leave a dog drooling with an upset stomach for a while. Most cases stay mild, though a big mouthful is worth a vet call.
Horses Mild
Horses that graze the foliage can end up with colic-style stomach upset and a dull, sluggish mood. Keep them away from the plants and any trimmings.
Rabbits Mild
The leaves and stems hold solanine and don't belong in a rabbit's diet. A small taste of foliage may bring on soft stools and a poor appetite.
Livestock Mild
Cattle, goats, and sheep can take a digestive hit from grazing the green tops, so fence them off from the rows and clippings.
Birds Mild
Pecking at the leaves or green parts can unsettle a bird's gut. Backyard hens generally leave the bitter foliage alone, but don't toss them trimmings.
People Ripe fruit safe
Ripe, cooked eggplant is a kitchen staple and safe to eat. Skip the raw leaves and stems, which carry the same solanine that troubles animals.
Keep pets and children from chewing leaves, stems, or green/unripe fruit; the cooked ripe fruit is edible.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Eggplant comes in far more than the one shape most stores sell. These are the types worth knowing by name.
Black Beauty / Italian types (e.g., Dusky, Epic)
These are the classic eggplants, carrying large, glossy purple-black oval fruit that most people picture first.
Ichiban (Asian type)
An Asian type that bears long, slender fruit with thin skin and tender flesh that cooks quickly.
Casper
A specialty variety prized for its smooth white skin, a striking change from the usual purple.
Hansel
A compact plant that sets clusters of small, slender fruit, which makes it a good fit for pots and tight beds.
Companions
Eggplant grows best beside beans and marigolds, and worst beside its nightshade cousins like potatoes, which trade the same pests and diseases back and forth.
Plant near
Beans: Listed as a beneficial companion for eggplant in extension companion-planting guidance
Marigolds: Listed as a beneficial companion; marigolds are associated with pest/nematode suppression
Keep apart
Potatoes: Listed as incompatible with eggplant; both are nightshades sharing pests and diseases
How to propagate
Eggplant is grown from seed, and the trick is giving it enough warmth and a long enough head start indoors before the season turns.
SeedModerate
Start indoors about 8 weeks before the last frost · 6 to 8 weeks to transplant size indoors
Eggplant is grown from seed started indoors about 8 weeks before your last frost. The seed wants warmth to wake up, so set the tray on a heat mat and hold the soil around 75°F to 85°F (24°C to 29°C). Give the seedlings 6 to 8 weeks to reach transplant size, and move them out only once nights are reliably warm.
Myths
Every part of an eggplant is poisonous, so the fruit is unsafe to eat.
The solanine-type glycoalkaloids gather in the leaves, stems, and unripe green parts, not in the fruit you cook. Ripe eggplant is a safe, everyday food, eaten around the world for centuries.