Ground plum is a low-growing prairie native that defies expectations: this hardy perennial legume produces edible, plum-like fruits on plants just 3 to 18 inches tall, making it one of the most unusual and rewarding vegetables for cold-climate gardeners. Astragalus crassicarpus thrives in zones 3 through 6, tolerating drought and poor soil with remarkable ease while producing showy flowers from April through June followed by distinctive fruiting pods. Native to prairies, rocky glades, and woodland edges across the central and western United States and Canada, this taprooted perennial brings prairie authenticity to gardens while asking almost nothing in return.
Full Sun
Moderate
3-6
18in H x 18in W
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Moderate
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Ground plum emerges from a woody, branched base to produce pinnately compound leaves and striking spring flowers in exchange for minimal care and zero fertilizer needs. The real draw is the fruit: clusters of swollen, plum-like pods develop close to the ground, edible at the tender-pod stage and visually arresting enough to serve as living ornament. This is a plant that succeeds in dry, shallow, rocky soil where almost nothing else thrives, and it actively attracts butterflies while requiring virtually no maintenance once established.
Ground plum fruits are eaten fresh at the tender-pod stage, when the swollen pods are still immature and most flavorful. The edible pods can be eaten raw as a snack or cooked as a vegetable, making this one of the few legumes where the immature fruit pod rather than mature seeds becomes the primary harvest. Its role as a native plant also makes it valuable for prairie restoration and naturalization projects, where it contributes to pollinator habitat and regional ecosystem health.
No timeline data available yet for this variety.
Start seeds indoors 6 to 8 weeks before your last spring frost in a seed-starting mix, maintaining germination temperatures between 55 and 70 degrees Fahrenheit. Keep soil evenly moist but not waterlogged during germination. Transplant seedlings carefully into individual pots, disturbing roots as little as possible, since this species resents root disturbance.
Harden off seedlings gradually over 7 to 10 days before moving them outdoors after the last frost date. Transplant into prepared beds in full sun, spacing 9 to 18 inches apart. Handle seedlings gently and avoid root damage; plant at the same depth they were growing in their containers. Water gently after transplanting but avoid excessive moisture once established.
Direct sow seeds in spring after soil has warmed to at least 55 degrees Fahrenheit. Sow seeds into prepared, well-drained soil in full sun, pressing them firmly into contact with soil. Keep the seedbed consistently moist until germination occurs, then thin seedlings as needed.
Harvest ground plum fruits at the tender-pod stage when the swollen pods are still immature and before they fully mature and harden. Pick pods when they feel slightly fleshy to the touch and have reached plum-like proportions but are still tender enough to eat without cooking. Harvest regularly throughout the fruiting season to encourage continued production and prevent pods from becoming woody.
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“Ground plum is a native prairie species with a deep history in North American ecosystems. Indigenous peoples of the central plains and western regions have harvested and valued these wild fruits for generations, using them fresh and preserved. The plant was documented by early botanists and naturalists exploring prairie landscapes, and it remained a staple of prairie plant communities long before modern gardening rediscovered its potential as a food crop. Its persistence in the wild and cultivation by Indigenous communities represents centuries of ecological integration on the Great Plains.”