Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants Pond weed control

You have FA because of the nutrients in the water. FA gets started before the Sago or other vascular plants get going. There are many different species of algae, some grow in cooler water, but die back when water warms up. That might correspond to the water temp where Sago grows in the early season. Then another type grows on the left over nutrients that the vascular plants don't use.

You can treat the FA with copper based products, such as Cutrine plus and it won't affect the Sago. Mix Cutrine Plus, Clearcast and an aquatically registered surfactant to whack them both at the same time when you spot treat an area.