Growing Eggplant in a Greenhouse: Heat, Light, and Water for Premium Fruit

Greenhouse eggplants (Solanum melongena) outshine field-grown in flavor, texture, and yield. 'Black Beauty' remains a benchmark, but try 'Rosa Bianca', 'Listada de Gandia', or Asian long types for variety.

Start Strong

• Sow 5–7 wks before last frost. 75–90°F for germination. Heat mat essential.
• Pot on at 2 true leaves. Bright light (14–16 hrs) or they stretch.
• Ventilation: critical. Stagnant air = fungal issues.

Transplant & Soil

• Plant when soil 70°F+. Space 18–24″.
• Rich, well-drained, pH 5.5–6.8. Amend with compost + balanced organic fertilizer.
• Mulch 1–2″ straw/grass at base—warms roots, conserves moisture.

Water & Feed

• High, consistent moisture. Drip irrigation ideal—keeps foliage dry.
• Separate from low-water crops (peppers, herbs).
• Feed biweekly with high-K liquid fertilizer after first fruit set.

Pollination & Support

• Greenhouse = no wind/bees. Shake plants daily or use a small brush to transfer pollen.
• Stake or cage early—fruit heavy.

Harvest

Clip when skin glossy, thumbprint springs back. Overripe = bitter, seedy.