Mosquito Fern (Azolla) Control in Frog Ponds

Azolla carpets the surface, shading out oxygenating plants. Excess nutrients (frog waste, fish food) fuel it. Controls:

• Skim regularly—removes nitrogen; compost the biomass.
• Add koi—they graze Azolla.
• Reduce feeding; remove excess organic debris.

No herbicides in a frog pond.