How to Grow New Guinea Impatiens
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New Guinea Impatiens
Impatiens hawkeri
flowerNew Guinea Impatiens is a stunning flowering plant known for its large, vibrant blooms and attractive foliage that ranges from green to deep burgundy. Unlike common impatiens, it tolerates more sun and produces larger, more colorful flowers on compact, bushy plants. It's an excellent choice for containers, garden beds, and tropical-style landscapes.
When should you plant New Guinea Impatiens in your zone?
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Example New Guinea Impatiens timeline · Pittsburgh, PA (Zone 6b)
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Plant New Guinea Impatiens
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 New Guinea Impatiens blooms
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact New Guinea Impatiens dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10-11; grown as annual in cooler zones or overwintered indoors
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Get my New Guinea Impatiens timeline →Growth Stages
Seedling
2-3 weeksTiny seedlings emerge with two cotyledons; delicate with minimal foliage
Maintain high humidity and warmth (70-75°F). Provide bright indirect light. Keep soil moist. Do not overwater to avoid damping off.
Vegetative Growth
3-4 weeksPlant develops true leaves and bushy branching structure; foliage becomes more prominent and colored
Pinch growing tips to encourage branching and bushier form. Provide moderate light and consistent moisture. Begin feeding with diluted fertilizer every 1-2 weeks.
Budding
2-3 weeksFlower buds begin forming at leaf axils; plant continues to branch
Continue pinching if desired for more compact growth. Maintain consistent watering and nutrition. Provide ample light to support bud development.
Flowering
2-3 months or until frostLarge, vibrant flowers (1.5-2 inches) bloom in red, pink, orange, white, or bicolor; blooms cover foliage
Deadhead spent flowers to encourage continuous blooming. Maintain consistent moisture and feeding schedule. Ensure adequate air circulation to prevent powdery mildew.
Decline
VariablePlant may become leggy in late season; flowering slows as temperatures cool or day length decreases
In frost-free zones, cut back by 1/3 in fall to rejuvenate. In cooler zones, bring indoors before frost or collect seed for next season.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Mist foliage regularly to increase humidity; use insecticidal soap or neem oil spray; increase air circulation
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Spray with strong water stream; use insecticidal soap or neem oil; introduce beneficial insects like ladybugs
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Use yellow sticky traps; spray with neem oil or insecticidal soap; maintain good air circulation
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Remove with cotton swab dipped in alcohol; spray with insecticidal soap; isolate infested plants
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Improve air circulation; avoid wetting foliage; spray with sulfur or potassium bicarbonate fungicide; remove affected leaves
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Control thrips and spider mites that spread the virus; remove and destroy infected plants; use resistant varieties when available
Uses
Ornamental garnish
CulinaryWhile not commonly consumed, the large, colorful flowers are edible and used as stunning garnishes for upscale desserts and cocktails. [source]
Container and landscape color
HouseholdExcellent for brightening shaded to partially sunny areas with vibrant flowers in mixed containers, hanging baskets, garden beds, and tropical-themed landscapes. [source]
Indoor houseplant
HouseholdCan be grown indoors near bright windows or under grow lights, providing long-lasting colorful blooms throughout winter in cooler climates. [source]
Pollinator attraction
WildlifeThe bright flowers attract hummingbirds, butterflies, and other pollinators, making it valuable for wildlife gardens and conservation landscapes. [source]
Harvest Tips
Deadhead spent flowers regularly by pinching or cutting just below the flower base to encourage continuous blooming throughout the season. Collect seeds by allowing flowers to dry on the plant; seed pods will burst when mature, scattering seed. For propagation, take softwood cuttings in spring or early summer and root in moist potting soil or water.
Fun Facts
- 🌱 New Guinea Impatiens was first discovered and cultivated on the island of New Guinea in the 1970s, and represented a major breakthrough for impatiens breeding with larger flowers and sun tolerance compared to Impatiens walleriana.
- 🌱 Unlike their cousins, New Guinea Impatiens can tolerate and even thrive in 4-6 hours of direct sun, making them far more versatile than traditional impatiens for brightening partially sunny locations.
- 🌱 The name 'Impatiens' comes from the Latin word meaning 'impatient,' referring to the plant's explosive seed pods that eject seeds dramatically when touched at maturity.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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