Grasses are the best because 50% of the carbohydrates manufactured by photosynthesis is pushed into soil as root exudate. Other plants only about a third. Cut the grass every two to four weeks and the cuttings are equivalent to 1 pound fertilizer per thousand square feet Native Americans knew to plant three plants: corn, beans and squash together and each grew better than planted separately because the fungi and bacteria worked together to better their carbo suppliers the plants. The greater diversity of plants the greater production by all. Start with grasses, cover crops, to restore soil fastest.