Green Floating Plants on Pond: Duckweed or Azolla?

Tiny floating lily-pad-like plants with ½" roots, clover-like, cover pond surface. Returned after winter. Barley powder failed. Dogs swim in pond—need safe removal.

Likely Duckweed or Azolla

High nitrogen fuels them. Koi love eating both. Barley doesn't control established mats.

Safe Removal

• Skim manually with fine net.
• Add koi (if pond suitable) or goldfish.
• Reduce nutrient input (fertilizer runoff, overfeeding).
• Beneficial bacteria to consume nitrogen.

Photo would confirm ID. Safe for dogs once removed.