How to Grow Australian Desert Pea
Australian Desert Pea
Sturt's Desert Pea (Swainsona formosa)
flowerThe Australian Desert Pea is a stunning native wildflower featuring brilliant scarlet-red flowers with a distinctive glossy black seed pod-like marking on each bloom. This climbing or trailing annual is endemic to central Australia and thrives in harsh, arid conditions. Its vibrant flowers and unique appearance make it a prized but challenging ornamental plant for gardeners outside its native habitat.
When should you plant Australian Desert Pea in your zone?
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Example Australian Desert Pea timeline · Pittsburgh, PA (Zone 6b)
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Plant Australian Desert Pea
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Australian Desert Pea blooms
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Australian Desert Pea dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 9b-11; best in hot, dry climates; can be grown as annual in cooler zones with careful management
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Get my Australian Desert Pea timeline →Growth Stages
Germination & Seedling
3-4 weeksTiny seedlings emerge with oval cotyledons and initial compound leaves. Growth is slow initially.
Keep soil barely moist, not wet. Provide bright light immediately. Germination can be erratic; scarifying seed coat improves germination rate. Be patient—seeds may take 2-4 weeks to sprout.
Vegetative Growth
4-6 weeksPlant develops trailing or climbing stems with distinctive finely divided, feathery compound leaves. Growth accelerates as temperatures warm.
Reduce watering to minimal levels; allow soil to dry significantly between waterings. Do not fertilize or use rich soil—poor soil conditions are preferred. Provide support structure if desired, though plant naturally trails or climbs.
Budding & Flowering
6-10 weeksClusters of striking scarlet-red flowers with glossy black 'boss' marking appear along the stems. Flowers are papilionaceous (pea-family form) and highly ornamental.
Maintain full sun exposure and dry conditions. Do not water the foliage; water only at soil level if absolutely necessary. Avoid any fertilizer applications. Remove spent flowers to encourage more blooms.
Seed Development & Maturation
4-6 weeksFlowers fade and distinctive inflated seed pods develop, aging from green to brown/black. Seeds darken and harden inside pods.
Allow pods to dry completely on the plant. Collect seed pods just before they naturally split open. Do not water during this stage. Harvest seed for next season's planting.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Ensure excellent drainage and avoid overwatering; this is the primary disease threat. Use sterile, well-draining potting soil. Improve air circulation around plants.
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Occur primarily indoors in dry conditions. Increase humidity slightly, spray with water, or apply neem oil as a last resort. Most outdoor-grown plants avoid this issue.
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and
Remove by hand or use slug baits sparingly. Improve drainage and air circulation to reduce slug habitat.
Uses
Traditional Indigenous Food
CulinaryAustralian Aboriginal peoples have traditionally harvested and eaten the seeds of Desert Peas as a nutritious food source. The seeds are high in protein and have been part of indigenous diets for thousands of years. [source]
Pollinator Support
WildlifeThe bright red flowers attract native Australian insects and bees, making it an excellent ornamental for supporting pollinators in arid gardens. The flowers evolved specifically to attract native desert fauna. [source]
Ornamental Garden Display
HouseholdThe stunning scarlet flowers with distinctive glossy black markings make this an iconic decorative plant for arid and xeriscape gardens. It is the floral emblem of South Australia and highly prized by native plant enthusiasts. [source]
Seed Collection & Propagation
CraftThe ornamental seed pods and viable seeds make this plant rewarding for gardeners interested in seed saving and plant propagation. Collectors prize heirloom seed varieties. [source]
Harvest Tips
Allow seed pods to fully mature and dry on the plant. Harvest pods just as they begin to split (typically 4-6 weeks after flowering ends). Place harvested pods in a paper bag to finish drying. Extract seeds and store dry in a cool location. Seeds remain viable for several years if stored properly. Do not harvest flowers for cutting; the plant produces few blooms and is best appreciated in the garden.
Fun Facts
- 🌱 Sturt's Desert Pea is the official floral emblem of South Australia and appears on the South Australian state badge. It is also featured on the back of the Australian one-dollar note.
- 🌱 The plant nearly became extinct in its native habitat due to over-collection and habitat loss, but careful conservation efforts have helped restore wild populations in central Australian deserts.
- 🌱 The distinctive glossy black 'boss' or marking on each scarlet flower is thought to serve as a nectar guide for native pollinators, directing them to the flower's reproductive organs.
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