A green cover crop is a good idea but in our area this is usually planted in the fall for winter cover. Then in the spring it is turned back into the soil and called a green manure. In the Northwest hairy vetch and field peas make good cover crops. I think it is a good idea to give the soil a break but for maximum improvement load plenty of compost on top of the soil and let the earthworms mix it into the soil for you. You can cover the beds with straw for the summer and then mix this into the soil after it rots as well. Soil improvement is always worth the work. Keep growing, Marianne Binetti