No-plant dedicated koi pond
Common for serious koi keeping. It keeps the pond easier to clean, reduces hiding places for waste, and makes fish observation easier.
Marginal plants
Plants around the edge can improve the garden look while staying partly separated from the koi. Use baskets, shelves, or external planting areas to keep roots protected.
Floating plants and lilies
They provide shade and surface interest, but koi may nibble, uproot, or damage them. Plant protection may be needed.
Bog filter plants
A separate bog or wetland filter can support water polishing and nutrient uptake. It should be designed for easy cleaning and should not become a hidden sludge bed.
Plant safety
Avoid toxic plants, pesticide-treated plants, sharp baskets, loose soil, and fertilizers that can affect fish. Rinse and quarantine plants when possible.
Practical recommendation
For a beginner koi pond, keep the main swimming area simple and cleanable. Add plants around the edge or in a separate bog zone rather than filling the main pond with soil and rocks.