I’m experimenting with a passive compost trench system along the sides of our forest garden beds. The bean borders/compost trenches are primarily for erosion control, building soil, boosting the worm population and suppressing weeds. Secondary benefits include beans for seed and food, attracting pollinators, and benefiting nearby plants with extra nitrogen and water. The bean/vetiver/compost borders also look really good. In a few years the vetiver will grow into 12” clumps and form a continuous hedge, which will provide a continual source of nutrient rich green manure.