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Gardening with Rabbits
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I read something about the peas. Are you saying to mulch with the hay or straw around the peas or to go ahead and make the compost and then test it?Smart Red said:If you are a purist then you won't want to use anything sprayed with Round-Up, but it won't cause problems in your compost pile or gardens. Picloram is the herbicide to watch out for. Anything sprayed with Picloram will remain toxic to soil for several years - even hay or grains passed through farm animals' digestive system are dangerous if used in the garden or compost pile.
The easiest way I know of to test for Picloram in straw, hay, or manure is to plant a few peas. Legumes are especially sensitive to the effects of Picloram and will quickly die while other veggies may just show poor growth and small harvests for the years it takes to remove the toxicity from the soil.