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In respect to this, will chickens eat preen?
Preen Weed Preventer - flower beds- chickens Yes eaten the wood mulch.
In respect to this, is preen toxic to humans?
Preen Weed Control Firstly, this product must be handled correctly as it is environmentally toxic and even harmful to human health. Even though this is a post-emergent granular weedicide, it does not contain highly toxic chemicals found in similar weed control products.
Information from Monsanto suggests Roundup to be safe for use around bird such as chickens; however, you may still have doubts about using herbicides, especially if your chickens are free range. In this case, consider using a more natural means of weed control. Use boiling water to scald weeds.