How do I eliminate this gross brown algae? It keeps coming back no matter what I try and it's getting to the point that it doesn't seem worth it to have small Medium Sansevieria Cylindrica Braided Pedestal Urn Planter Garden Pedestals Stone Pedestals Some of my 42 varieties of crotons in my garden. I love the color these bring to my yard. Hoping to top 55 varieties this year. : r gardening Invasive Plants Invasive Species Centre