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Q.Are Hollyhocks Toxic to Ponds and Their Fish

Zone 87112 | lydiamathews added on April 15, 2013 | Answered

My pond is turning mucky and green. I know the green is algae but I have noticed a plant the is growing just on the outside of the pond and it does touch the water. I believe it is the reason for the pond’s muckiness and the horrid smell.

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Certified GKH Gardening Expert
Answered on April 16, 2013
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Answered on April 16, 2013

I find no data showing Alcea being toxic to fish. As far as the muck and smell of your pond, this article might be of help: https://apps.rhs.org.uk/advice/profile?pid=447

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