How to Grow Scarlet Hedgehog
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Scarlet Hedgehog
Gomphocarpus physocarpus
flowerScarlet Hedgehog is an ornamental annual or tender perennial known for its distinctive inflated, hairy seed pods that resemble tiny hedgehogs in shades of scarlet-red. The plant produces delicate white or pale pink flowers before developing these eye-catching balloon-like fruits. It's a charming curiosity plant that adds unique texture and visual interest to gardens and containers.
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Example Scarlet Hedgehog timeline · Pittsburgh, PA (Zone 6b)
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Plant Scarlet Hedgehog
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 Scarlet Hedgehog blooms
Around Jul 16≈ 90 days after planting
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9-11; grown as an annual in cooler zones
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Seedling
2-3 weeksTiny seedlings with first true leaves appearing within 1-2 weeks. Plant is very delicate and vulnerable.
Keep soil consistently moist but not waterlogged. Provide bright light and good air circulation to prevent damping off. Thin seedlings to proper spacing once established.
Vegetative Growth
4-6 weeksPlant develops bushy foliage with narrow, lance-shaped leaves. Multiple stems branch from the base, creating a compact mounding form.
Pinch back growing tips early to encourage branching and bushiness. Provide consistent moisture and light feeding with balanced fertilizer every 2-3 weeks.
Flowering
6-8 weeksDelicate small white, pale pink, or lavender flowers appear in clusters at branch tips. Flowers are short-lived but produced continuously.
Continue watering and feeding as blooms appear. Flowers indicate pollination is occurring and seed pod development will follow.
Fruit Development
8-10 weeksAfter pollination, distinctive inflated, papery seed pods develop. Pods are hairy, balloon-like structures that turn scarlet-red at maturity, resembling tiny hedgehogs.
Reduce nitrogen fertilizer to encourage pod development. Maintain moderate watering; excess water can cause pod splitting. The pods are the main ornamental feature of this plant.
Seed Maturity & Harvest
Until frost or end of seasonSeed pods dry and become papery. Seeds inside are fully mature. Pods may split open naturally to release seeds.
Allow pods to fully dry on the plant for seed collection. Harvest pods before they split if you wish to save seeds. Dead-head spent flowers to encourage continuous pod production.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use insecticidal soap or neem oil if severe. Increase humidity to discourage mites.
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Use yellow sticky traps; spray with neem oil or insecticidal soap. Encourage natural predators like ladybugs.
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Remove with alcohol-soaked cotton swab; spray with insecticidal soap or horticultural oil for heavy infestations.
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Spray with strong water stream; use insecticidal soap or neem oil. Attract beneficial insects like ladybugs.
Uses
Dried Flower Arrangements
CraftThe distinctive scarlet seed pods are prized for adding unique texture and visual interest to dried flower arrangements and dried floral displays. They maintain their shape and color well when dried. [source]
Container & Garden Ornament
HouseholdThe quirky hedgehog-like seed pods make this a conversation-starting specimen plant for containers, pots, or garden beds. It's excellent for adding novelty and whimsy to indoor or outdoor spaces. [source]
Pollinator Support
WildlifeThe delicate flowers attract bees, butterflies, and other pollinators to the garden. The developing seed pods provide interest throughout the growing season. [source]
Seed Saving
CraftSeeds mature reliably in the papery seed pods and can be collected and saved for next season, making this an excellent plant for heirloom seed collectors. [source]
Harvest Tips
For ornamental enjoyment, allow seed pods to develop fully and turn scarlet-red on the plant for maximum visual impact. To collect seeds, harvest mature pods when they begin to feel papery but before they split naturally. Store dried pods in a cool, dry place. Pods can be dried and used in flower arrangements or for seed saving.
Fun Facts
- 🌱 The common name 'Hedgehog' comes from the plant's resemblance of its seed pods to tiny hedgehogs, especially when the papery spines cover the inflated balloon-like structure.
- 🌱 Scarlet Hedgehog is native to South Africa and is sometimes called 'Balloon Plant' or 'Hairy Balloon Plant' due to the distinctive hairy, inflatable seed pods.
- 🌱 In mild climates, this plant can self-seed readily and return year after year, though it's typically grown as an annual in most temperate regions.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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