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Growing Guide: Eggplant

A pile of purple vegetables with green stems and leaves

Grow and Save Eggplant seeds

How to Grow Eggplant

Eggplant can be a beautiful addition to your garden. Eggplant enjoy a long growing season, but you can extend your season by starting plants indoors.

Time of Planting

It is best to sow eggplant indoors 7-10 weeks before transplanting outside. Start eggplant inside 3-4 weeks before the last frost. Transplant outside 4-6 weeks after the last frost into a warm and sunny location.

Spacing Requirements

Sow eggplant seeds ½ inch deep. Space plants 18-24 inches apart.

Time to Germination

10-14 days

Special Considerations

Make sure outdoor soil temperatures are at least 55-60 degrees F before transplanting eggplants.

Common Pests and Diseases

Eggplant can suffer damage from aphids, cucumber beetles, flea beetles, anthracnose, and Tobacco Mosaic Virus. To protect against insect predation, transplants can be row-covered in the spring.

When and How to Harvest for Food Consumption

When harvesting eggplant for fresh eating, pick fruits when they are large but not too firm to the touch. Keep in mind that eggplant needs to continue growing far past market maturity if you want to save seeds.


Eggplant can be roasted, grilled, pureed into baba ghanoush, or fried up as a main course. Its meaty texture withstands long cooking times. Try this Steamed Eggplant – Hunan Style from Eric Hsu, a staff member at Chanticleer Garden, adapted from The Woks of Life, or this Eggplant, Onion, and Feta Tart from Janine Gilbertson.


Eggplant fruits can be stored for about a week in the refrigerator.

How to Save Eggplant Seeds

Life Cycle


Recommended Isolation Distance

Separate varieties by 300-1,600 feet.

Recommended Population Sizes

To ensure viable seeds, save seeds from at least 1 plant. When maintaining a variety over many generations, save seeds from 5-20 plants. If you’re saving seeds for genetic preservation of a rare variety, save seeds from 50 plants or more.

Assessing Seed Maturity

At seed maturity, eggplant fruits generally change color, taking on a yellow or brownish cast, and their glossy skins become dull. Their flesh will soften and ripe fruits easily separate from the plant when pulled.


Simply pull ripe fruits from the plant.

Cleaning and Processing

Seed-mature eggplants can be extracted by cubing the fruits and processing them in a food processor with a small volume of water to make a slurry of seeds and flesh. To prevent seed damage, use a dough blade instead of a chopping blade. After blending, pour the seed slurry into a larger container and add more water. Agitating the watery mash will dislodge seeds from the pulp and allow the viable seeds to settle to the bottom of the container. Repeated decanting will remove most of the pulp and any immature seeds. The mature seeds that remain can then be transferred to a strainer and rinsed with a strong stream of water. Immediately after rinsing, seeds should be spread in a thin layer on screens or coffee filters to dry in a warm, well-ventilated space.

Storage and Viability

Store eggplant seeds in a cool, dark, and dry place in an airtight container. When stored in these conditions, eggplant seeds will remain viable for 4-6 years.

Eggplant is a wonderfully diverse crop type that can be addictive for chefs and seed savers alike. Though its spongy flesh makes seed removal a bit more complicated, saving seeds from this self-pollinating Solanum is fairly straightforward. Watch this video to learn how you can grow and maintain many different varieties in your own backyard.