Cottonwood Seed Management: Florel Growth Regulator for Cotton Control

A homeowner with multiple female cottonwoods asks if they always drop seeds (cotton), why it's worse now than 5 years ago, and how long shedding lasts.

Seed Production Facts

• Timing: South = May-July; North = June-July
• Duration: 4-6 weeks typically
• Variability: Weather during flowering affects amount; larger trees produce more
• Persistence: Yes, mature females produce cotton annually

Chemical Suppression Option

Florel® Brand Growth Regulator (ethephon) applied just before flowering causes blossom abortion, preventing seed formation.

Critical Application Requirements

• Professional arborist required—large tree coverage needs specialized equipment
• Precise timing: Just before flower bud break (varies yearly/regionally)
• Annual treatment needed
• Cost-benefit: Worth it for high-value landscapes/pools

Product Information

Monterey Lawn & Garden Florel Info

Alternative: Accept and Manage

If treatment isn't feasible: use pool covers, increase filtration, accept seasonal cleanup. Cotton is a nuisance, not a hazard.