Nitrogen fixers

Trees – black locust, acacia, red or black alder, golden-chain tree, silk tree, mountain mahogany

Shrubs – Russian olive, wax myrtle, Siberian pea shrub, buffaloberry, scotch broom (too fragrant for our taste, ceanothus, goumi, Autumn olive

Ground covers - clover

Legumes
*Alfalfa (250 pounds per year)