How to Manage Pests

Cultural Tips for Growing Eggplant

In This Guide

Site selection

Plant your garden in a convenient location, where you can check it frequently. Choose an area near an abundant supply of water so you can water as needed easily. Vegetables do best if they receive full sunlight (at least 4 to 6 hours a day). Plant them in a well-exposed area in the garden, where they are not shaded by trees, fences, or walls. Try to plant away from areas that will be watered by lawn sprinklers.

Whenever possible, select a location that is not heavily infested with weeds, especially weeds such as field bindweed, nutsedge, and Bermudagrass that can be hard to control with hand weeding. Also avoid areas that have had previous disease problems.

Try to plant on level ground. Level ground is easier to work on than sloping ground. Vegetables will do well on a wide range of soils; they do best in well-drained soils. If your soil forms a clump when squeezed, then it is too wet; if the soil crumbles easily, it is a good soil to use. Damp soil surfaces encourage snails, slugs, sowbugs, and root diseases; fruit decay and leaf spot diseases may also increase. Soil amendments can make clay and sandy soils easier to work with, and correct soil preparation can improve poor soil.

Adding organic matter (compost, peat moss, manure, sawdust, ground bark) makes clay and sandy soils easier to work with. The soil should be kept at a pH level of 6.0 to 6.5. Lime or gypsum can be added to soils low in calcium.

Soil recommendation

Sandy to sandy loam soils; heavier soils are good provided that they drain well and are irrigated to avoid saturated conditions.

Soil improvement

Any type of soil can be improved with soil amendments. Heavy clay or sandy soils can be improved by adding organic material such as compost, manure, or leaf mold. Texture is an important consideration when choosing an amendment. An amendment that is granular and fine grained is important for container mixes. For gardens, a more coarse-grained amendment can improve drainage and aeration. Work amendments into soil by rototilling, raking, or double-digging.

Soil preparation

The preparation of your soil is just as important as adding fertilizer and soil amendments. Before working the soil, make sure it is moist but not thoroughly wet.

1. Use a shovel, rototiller, metal bow rake, or all of them together to loosen the top 1 to 2 inches of soil. Rake the area to remove weeds and old crop debris. Be sure to dig out roots.
2. Irrigate the plot deeply to encourage the germination of weed seeds.
3. In a week or two, after a substantial number of weeds have germinated, work the area again to kill the weed seedlings. Be sure to break up the clods in the soil, as seeds planted in cloddy soil will germinate poorly and won't live long because the soil dries too quickly.
4. Form soil into beds if desired, and plant while soil is still wet.

Time to plant

Eggplant requires warm temperatures for optimum growth and fruit development. A long growing season of 70 to 120 days, depending upon the variety, is required for transplanted crops. The ideal daytime temperatures should be in the range 80° to 90° F and night time temperatures should not go below 60° to 65° F. Eggplant is intolerant of frost, and growth will be significantly retarded if night temperatures are below 60° F. Once plants reach the flowering stage, low temperatures and low-intensity light will cause pollen to be nonviable and fruit will likely not set.

Planting Eggplant

Eggplants are suitable for a small garden if compact varieties are grown. Eggplants are generally not seeded directly but grown from transplants because of their long growing season requirements.

For transplants, use young plants, 3 weeks old with 4 to 6 true leaves, wider than tall, stocky, succulent, and slightly hardened to outdoor conditions. Make sure the planting site is level. Spread and mix organic matter and a high granular phosphorus fertilizer over the area. Mark where you want each plant and make the hole deep enough to bury the stem as far as the first leaf. Place plants about 18 to 24 inches apart in 3 to 5 feet rows. Press the soil firmly around the plant and water thoroughly to remove any air pockets. If transplanting in the summer, shade the plants in the middle of the day for the first week or use floating row cover.

Fertilizing

Most vegetables require fertilizer for growth. Organic materials, such as manures and compost, and inorganic materials, such as chemicals, can be used to fertilize plants. Using both types of materials usually provides the best growth. Manures and compost can be used to increase soil fertility. They are usually applied at 1 pound per 4 or 5 square feet. These materials should be worked into the soil several weeks before planting in order to allow it to decompose. Manure that contains straw, sawdust, or similar materials should be applied with a commercial nitrogen fertilizer. Generally, if the soil has been properly amended with compost or manures or other organic materials, the only nutrient needed is nitrogen, if anything. Some commercial nitrogen fertilizers available are urea, ammonium sulfate, calcium nitrate, and ammonium nitrate. Apply these fertilizers at rates of 0.5 to 1 pound of nitrogen per 100 feet of row.

If manure and other organic material has not been used, apply fertilizer that contains both nitrogen and phosphorus before planting. All commercial fertilizers are labeled by the percentages of N-P-K; nitrogen (N), phosphorus (P), and potassium (K). Some common mixed fertilizers are 5-10-5, 5-10-10, 8-16-16, and 12-12-12. Apply these fertilizers at rates of 1 - 2 pounds per 100 feet of row. After plants are 3 to 4 inches tall, sidedress nitrogen in narrow bands or furrows and water thoroughly after application, or apply through the drip system. Consider light but frequent applications of nitrogen fertilizer every 3 to 4 weeks. Avoid letting the fertilizer come into contact with the plant stems to avoid burning.

Application tips

Inorganic fertilizers can be sidedressed. Manures are more difficult to use as a side dressing and must be tilled into the soil.

Banding: Make a small groove 1 or 2 inches deep on both shoulders of the bed, 4 to 6 inches from the plant row and band in the fertilizer. Replace the soil and irrigate.

Where drip or trickle tubes are used, apply fertilizer on the soil surface near the drip tube.

Watering Eggplant

Proper watering is very important. Drip irrigation or furrow irrigation on raised beds, instead of using sprinklers, will keep your soils well drained and protect against diseases such as root rot. Keep the root zone moist throughout the growing season. One or two waterings during the first month will help establish the plant. Eggplants root to about 2 feet deep and plants should not be subject to water stress. Stress during the bloom can cause substantial reduction in fruit set. Keep adequate moisture in the deeper soil layers even when plants are small. Deep moisture is harder to replace later in the growing season without over irrigating.

Harvesting and Storing Eggplant

Eggplant will begin to flower and set fruit 6 to 8 weeks after transplanting. After that it will take about 3 weeks for the fruit to be ready although it can be harvested and eaten at any earlier stage of development. Fruit should be harvested while still glossy. When the color dulls, the seeds become dark and the flesh becomes bitter. Because the stems are tough, use a sharp knife or hand clippers to remove the fruit from the plant. Eggplants do not have a long shelf life and should be used quickly after harvest. They will keep for about 7 to 10 days at 45° to 50° F.