Algae growing on newly sown lawn - Knowledgebase Question

San Francisco Bay Area, CA
Question by markwaynek
September 8, 2017
In the past few weeks, I removed previous grass/weeds and rototilled a small area to replant with fescue blend grass seed. 10 days after with many of the seeds sprouted we had a heat wave (100+ temps) and suddenly I had green algae growing on a big portion of the new lawn. It is choking out the small grass starts and spreading. I have tried a 1:3 ratio of H2O2 to water as recommended by some but it didn't help. Any suggestions on killing the algae without killing the surviving grass starts in the area?

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