When your eggplant flowers drop without setting fruit, temperature stress is almost always the cause. Nights below 60°F (16°C) stop your fruit from forming no matter how healthy your plants look. Heat waves above 95°F (35°C) cause the same problem.
I lost half my flowers during a late spring cold snap two years ago. My plants looked fine, but blooms fell off every morning. Once I covered them with fabric at night, the drops stopped. The next batch of flowers all turned into fruit.
Eggplant blossom drop happens when your plants face stress they cannot handle. Your plant shuts down fruit set to save energy for survival. It will try again once conditions improve. This is a built-in response, not a sign of plant disease.
Cold stress is the top cause in most gardens. Eggplants evolved in tropical Asia where nights stay warm. When your temps dip below 60°F (16°C), pollen becomes sterile. Your flowers cannot form fruit without good pollen, so they drop.
Heat stress causes the same outcome through a different path. When temps climb past 95°F (35°C) for several hours, your pollen dies. Flowers that were ready to set fruit give up and fall off. This hits your garden hardest if you live in the South or Southwest.
If you notice your eggplant not fruiting despite plenty of flowers, check your watering habits. Dry soil stresses your plants and triggers flower drop. Too much water causes root rot, which creates the same stress response.
Water your plants deep once or twice per week rather than a light splash every day. Your soil should stay moist but never soggy. Mulch around your plants to keep moisture levels steady between waterings.
Too much nitrogen fertilizer pushes leafy growth at the expense of fruit. Your plants look lush and green but drop flowers. Cut back on nitrogen once your plants start blooming. Switch to a fertilizer higher in phosphorus to boost your fruit set.
Poor pollination can cause eggplant flower problems too. Eggplant flowers contain both male and female parts. Wind or bees shake pollen loose to complete the process. On calm, cool days, this does not happen in your garden.
I hand-pollinate my eggplants when pollinators are scarce. You can use a small soft brush or cotton swab. Gently swirl it inside each open flower. This moves pollen where it needs to go. Do this in the morning when your flowers are fresh.
Afternoon shade helps your plants survive heat waves. A light shade cloth that blocks 30-40% of sun keeps temps in your safe range. Remove it once the heat breaks so your plants get full light again.
Row covers protect your plants from cold snaps. Keep fabric handy all season. Check the forecast each evening. Cover your plants when nights will dip below 60°F (16°C). Remove covers in the morning once temps rise.
In my experience, flower drop frustrates every eggplant grower at some point. The good news is that your plants recover fast once stress ends. New flowers will form and set fruit if you fix the underlying cause. Stay patient and keep giving your plants the care they need.
Read the full article: Growing Eggplant: Professional Tips for Larger Harvests
