Cover crops in vineyards mitigate erosion, boost soil nutrients

By Sam Jones

When the winter rains come to Napa Valley, soil erosion is at the top of many viticulturists’ minds. Terracing and other structural changes to the terroir are largely a mitigation method of the past, with many vineyards planting the grassy patches between their rows with mustards, legumes, and grasses as cover crops.

And while the blooming yellows of mustard certainly brighten up Napa’s landscape each year, these widespread plants have important ecological benefits as well.

“It’s all about watershed protection,” said Molly Moran Williams, Industry and Community Relations Director for the Napa Valley Grapegrowers. “Cover crops on hillsides prevent erosion, which, in return, protects our river and watershed.”
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“On top of that, in vineyards all over the valley, cover crops add nutrients back into the soil, increase microbiome diversity, and are used widely as a climate-smart farming practice.”

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