Yes it is. Last year's clippings are a great source of organic matter for the garden. If you wish to use fresh clippings from turf that was sprayed with a weed control product, you should compost the clippings first or mix them into the soil a few weeks prior to planting. This will allow time for the products to break down and/or tie up in the soil.
Some vegetables such as tomatoes are especially sensitive to these products and could be damaged if mulched with fresh, treated clippings.
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