- Name: Ground Plum - Other Common Names: Groundplum / Ground Plum Milkvetch / Buffalo Pea - Scientific Name: Astragalus Crassicarpus Syn. Astragalus Mexicanus / Astragalus Succulentus / Geoprumnon Succulentum - Color: Lavender, Purple, & White - Plant Seeds: Fall Sow Seeds Or Cold Stratify - Bloom Time: May - June - Hardiness Zone: 3 - 8 - Plant Height: 18 - 24" - Plant Spacing: 12 - 15" - Light Requirements: Sun - Soil & Water Preferences: Average - Quantity: 10 Seeds - Other: The Ground Plum Is A Beautiful Ground Cover That Is Native To The Us & Canada. Pink, Purple, & White Pea Like Flowers Bloom In 3/4" Long In Clusters On Stalks Above The Foliage. The Foliage Is Ferny & Resembles That Of A Vetch. They Get Their Common Name Ground Plum From The ½ - 1” Ornamental Fruit That Ripens To Purple Like A Plum. The Fruit Starts Out Green, & Turns Lovely Blushing Shades Of Pink & Apricot Before Maturing In Purple. The Ground Plum Is A Legume, And Is An Extremely Lovely Way Improve The Nitrogen Levels In Your Soil! They Can Grow In Sandy Soil. Ground Plums Are A Host Plant For The Afranius Duskywing Butterfly.