Posted: 30/05/2012 at 20:26
Koi carp are not the easiest of fish to keep in a garden pond - and darned expensive if they provide Mr Heron with a meal or two!
Blanket weed is worse when there is an open surface of pond, so spreading plants are a benefit. Obviously, waterlilies, but also floating plants like water chestnut.
btw after a number of ways of trying to prevent the heron from taking our fish, we have finally discovered that a grid of floating, open-weave "trellis" (for want of a better description) around the pond margin is the least visually intrusive, and the most effective. The company that supplies them is called Netfloat (www.netfloat.co.uk)