The Floating Hyacinth Island protects your floating plants from pond fish such as koi which will readily devour the root systems of these plants. Keeps floating plants from being pulled into a skimmer box Easy to use-simply place floating plants in the ring Plants sold separately For use with floating plants only! The Floating Hyacinth Island protects your floating plants from pond fish such as koi which will readily devour the root systems of these plants. Another advantage of this product is that it will keep floating plants from being pulled into a skimmer box. This product has a 3 foot diameter floating tubular enclosure from which black netting is suspended down into the water. Simply place the floating plants of your choice into this floating ring and let them multiply naturally to fill out the enclosure-results in a beautiful effect! Plants sold separately.