Preen Landscape Fabric in a Fish Pond: Harmful to Fish

Preen Is a Herbicide

Preen (trifluralin) prevents seed germination. It is toxic to fish and aquatic invertebrates. Do not use in a pond.

Floaters: Water hyacinth, water lettuce, azolla—roots filter water, shade surface.
Barley straw: Mini-bale or liquid extract.
Submerged oxygenators: Anacharis, hornwort compete for nutrients.
Manual removal: Rake string algae weekly.

Pond and Water Gardening: Fish Dying After Pond Relocation; Dead Koi After Spring Startup: Salt or Not?; Installing an Oversized Pond Liner: Techniques for a 17x20 ft Liner in an 8x6x4 ft Pond; Winterizing a Small Goldfish Pond in Texas; Chlorine Overdose from Forgotten Hose: Saving Koi; Mass Fish Kill from Oxygen Depletion: Bubbles, Overstocking & Blue Dye Mistake; Keeping Trout Alive in Summer Heat: Oxygen, Temperature & Stocking Limits; Pond Empties Overnight Intermittently: Splash, Deer, or Hidden Leak; Catfish Turning White: Water Quality, Diet & Runoff Investigation; Foaming Pond: Why It's a Sign of Poor Water Quality and How to Fix It

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