Sunflower Seed Hulls and Bare Patches Under Feeders

Allelopathy or Animal Traffic?

Sunflower hulls contain compounds that inhibit some plants, but research doesn’t confirm strong effects on St. Augustinegrass. The bare circle is more likely caused by birds and rodents scratching the soil while feeding.

Simple Fix

Install a seed‑catch tray or “seed guard” under the feeder to keep hulls and critters off the turf.