Preventing Plum Tree Fruiting with Growth Regulators

Chemical Fruit Thinning Options

If your plum produces more fruit than you can manage, two registered products can reduce fruit set:

• Florel (ethephon) - applied at bloom
• Fruitone (NAA) - applied at petal fall

Critical Considerations

• Pollinator safety: Both can harm bees. Apply only when bees are not foraging (early morning/late evening).
• Timing is everything: Wrong stage = no effect or tree damage.
• Cost: Expensive for large trees; requires spray equipment.
• Annual application needed.

Better Long-Term Solutions

• Consult a certified arborist for proper thinning pruning.
• Contact your county extension agent for local recommendations.
• Consider replacing with a sterile ornamental plum if fruit isn't wanted.

Get Local Help

Provide your county (you're in central Kentucky) and I'll find your extension contact. They offer free, research-based advice tailored to your area.

Chemical fruit suppression is a last resort. Cultural management (pruning, variety selection) is usually more sustainable.