How to Grow Jacobinia
Jacobinia
Justicia carnea
shrubJacobinia is a tropical flowering shrub known for its striking pink, red, or white flower spikes that bloom prolifically in warm conditions. It's an evergreen plant that can reach 3-6 feet tall and is popular as both an indoor houseplant and outdoor ornamental in warm climates. The plant produces dense, velvety foliage with attractive flowers that attract hummingbirds and butterflies.
When should you plant Jacobinia in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Jacobinia timeline · Pittsburgh, PA (Zone 6b)
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Plant Jacobinia
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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Harvest Jacobinia
Around Aug 15≈ 120 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Jacobinia dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 10-11 for outdoor cultivation; can be grown indoors in any zone
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Seedling
3-4 weeksTiny seedlings with first true leaves emerging, delicate and pale green
Keep soil consistently moist, provide bright indirect light, maintain warm temperatures (70-75°F), ensure high humidity
Vegetative Growth
6-10 weeksPlant develops multiple stems and dense foliage with oval-shaped green leaves; no flowers yet
Pinch tips regularly to encourage bushiness, feed with balanced fertilizer every 2-3 weeks, maintain warm conditions above 60°F
Pre-flowering
2-3 weeksFlower buds begin forming at stem tips as dense conical structures, plant looks full and mature
Reduce nitrogen fertilizer slightly, increase phosphorus to encourage blooming, maintain consistent moisture and high humidity
Flowering
6-12 weeks, may repeat seasonallyVibrant flower spikes open with tubular flowers in pink, red, or white colors; peak ornamental display
Deadhead spent flowers to encourage continued blooming, maintain consistent watering, provide bright light for best color
Rest/Dormancy
2-4 monthsFlowering slows in winter, growth rate decreases, plant may drop some lower leaves
Reduce watering slightly, lower feeding frequency, provide cooler temperatures (60-65°F) to trigger next bloom cycle
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with insecticidal soap or neem oil, isolate infected plants, manually remove with cotton swabs dipped in alcohol
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Increase humidity, spray leaves with water, use miticide if severe, ensure adequate air circulation
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Use yellow sticky traps, spray with neem oil or insecticidal soap, improve air circulation
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Manual removal with soft brush, treat with horticultural oil or neem oil spray
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Spray with strong water stream, use insecticidal soap, apply neem oil, encourage natural predators
Uses
Decorative floral arrangements
CulinaryThe long-lasting flower spikes make excellent cut flowers for tropical or exotic floral arrangements. They add vibrant color and height to mixed bouquets and can last 1-2 weeks in water. [source]
Indoor houseplant decoration
HouseholdPopular as a showy houseplant that brightens indoor spaces with continuous flowers in proper conditions. Ideal for warm, humid rooms like bathrooms or plant-heavy living areas. [source]
Pollinator attraction
WildlifeThe tubular flowers attract hummingbirds and butterflies, making it valuable for creating pollinator-friendly gardens in tropical and subtropical regions. [source]
Dried flower crafts
CraftFlower spikes can be dried for use in potpourri, dried floral arrangements, and craft projects while retaining their attractive shape and color. [source]
Traditional herbal use
MedicinalIn traditional medicine systems, particularly in South America and tropical regions, Justicia species have been used in herbal preparations for various therapeutic purposes, though scientific evidence is limited. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Not typically harvested like vegetables. Cut flower spikes for indoor arrangements once flowers are open, cutting just above a leaf node. For propagation, take 4-6 inch softwood cuttings in spring or early summer and root in moist soil or water. Prune back hard in late winter to rejuvenate plant and encourage bushier growth with more flowering stems.
Fun Facts
- 🌱 Jacobinia is also known as the Flamingo Flower or Water Hyssop, and is native to Brazil and tropical South America where it grows as an understory shrub.
- 🌱 The plant's flowers remain in bloom much longer than typical tropical flowers, sometimes staying colorful for several months with proper care.
- 🌱 Jacobinia is particularly responsive to pruning—cutting it back by one-third in late winter often results in a fuller, more densely-flowered plant in the growing season.
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