The tiny yellow trumpets with silvery outside of Elaeagnus commutata, commonly known as silverberry or wolf willow. This plant has numerous traditional and modern uses, including as a nitrogen fixer for soil. This Frequently Asked Questions Real Tiny Plants Coffee Grinds as Fertilizer Top Plants That Like Coffee Grounds Roses Coffee grounds add nitrogen, which promotes lush foliage and vibrant blooms. Application: Mix grounds into the soil at the base of Removing and Replacing Plants in a Garden The Martha Stewart Blog