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You may need to have the soil tested, as it could have a nutrient deficiency. This article will help with growing this ground cover: https://www.gardeningknowhow.com/lawn-care/lawn-substitutes/white-clover/grow-a-white-clover-lawn.htm

This perennial clover grows 1 to 2 feet tall. The leaves are green and the large flowers begin as big silvery buds that open on long stems to a bright red feathery flower. This is an excellent plant for attracting butterflies, hummingbirds and bees. It is grown much the same as other types of clover plants, enjoying both sun and shade as well as fertile soil (though it is hardy enough to grow in many soil types).

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If it were not an active growing season, the clover would be beneficial because it puts nitrogen back in the soil. But since the clover will be competing with your vegetables for nutrients and water, I would remove it at this time.

I'm answering my own question. First, sulphur is almost impossible to dissolve without heavy-duty chemicals. But -- after more searching I became convinced of the many advantages of a clover lawn over grass. Sounds like an ideal solution. I'm now growing a grass-and-clover lawn and will be pleased to watch the clover continue to spread. Thanks anyway.

White clover mostly reproduces through its roots but may also self-seed. Here is more information on white clover lawns: https://www.gardeningknowhow.com/lawn-care/lawn-substitutes/white-clover/grow-a-white-clover-lawn.htm