How to Grow Zanzibar Red
Wikimedia Commons
Zanzibar Red
Ricinus communis 'Zanzibar Red'
shrubZanzibar Red is a striking ornamental castor bean plant grown for its dramatic dark burgundy foliage and architectural form. This tender perennial shrub produces large, deeply lobed leaves with deep red-purple coloration and can reach 6-10 feet tall in a single season. It's prized as a specimen plant, accent, or backdrop in tropical and warm-climate gardens.
When should you plant Zanzibar Red 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 Zanzibar Red timeline · Pittsburgh, PA (Zone 6b)
-
Plant Zanzibar Red
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Zanzibar Red
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Zanzibar Red dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 9b-11; grow as an annual in cooler zones or overwinter indoors
Sign up free to see if Zanzibar Red grows in your zone — and get a personalized planting timeline.
Get my Zanzibar Red timeline →Growth Stages
Germination & Seedling
2-3 weeksSeeds sprout in 7-14 days; seedlings emerge with paired cotyledons and begin developing first true leaves
Keep soil warm (70-75°F); maintain consistent moisture; provide bright light; thin seedlings to strongest plant if direct sowing
Early Growth & Establishment
3-4 weeksPlant develops 2-4 true leaves; stem thickens and initial burgundy coloration becomes visible; roots establish
Gradually acclimate outdoor seedlings to sun; water regularly; consider staking if grown in windy locations; apply dilute fertilizer
Vegetative & Foliage Development
4-8 weeksPlant rapidly increases in height and width; leaves become larger with intense burgundy-red coloration; stems darken; plant takes on sculptural form
Maintain consistent watering; fertilize every 2-3 weeks with balanced fertilizer; prune lower leaves for desired form; provide sturdy support if needed
Flowering
2-4 weeksTall spikes of small greenish flowers appear at branch tips; flowers are not ornamentally significant but precede seed development
Remove spent flower spikes if seed production is not desired; this redirects energy to foliage; continue regular watering and feeding
Seed Pod Development & Season End
4-6 weeks until frostSpiky seed pods form and mature; foliage may begin to decline in fall if temperatures drop; plant enters dormancy or dies back
Allow pods to mature if seeds desired; harvest before frost; trim back dead growth; in zones 9-11, plant may overwinter if protected
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Spray with water to dislodge; use insecticidal soap or neem oil; maintain humidity; ensure adequate air circulation
-
Remove with rubbing alcohol on soft cloth; spray with neem oil or insecticidal soap; isolate affected plants
-
Scrape off manually; spray with horticultural oil or neem oil; treat every 7-10 days as needed
-
Hand-pick in early morning; use beetle traps; apply neem oil; use row covers on young plants
-
Spray with water; use yellow sticky traps; apply insecticidal soap or neem oil weekly
Uses
Ornamental Accent & Tropical Landscaping
HouseholdZanzibar Red's dramatic burgundy foliage and architectural form make it an ideal specimen plant, focal point, or backdrop in gardens, containers, and landscapes. Its height and bold coloring create instant drama and tropical ambiance. [source]
Cut Foliage & Floral Arrangements
CraftLarge, deeply lobed leaves add textural interest and bold color to fresh and dried arrangements. Stems last 1-2 weeks in water when cut properly. [source]
Ornamental Support for Pollinators
WildlifeFlowers attract bees and other pollinators, adding ecological value to gardens. The tall plant structure provides shelter for beneficial insects. [source]
Tropical Container Growing
HouseholdExcellent as a potted specimen for patios, decks, and conservatories. Can be overwintered indoors in cooler climates or moved to sunny locations during cold months. [source]
Castor Oil Production (Advanced/Historical)
MedicinalCastor beans (Ricinus communis seeds) have been used for centuries to produce castor oil, valued for skin care, laxative, and industrial applications. Note: Seeds are toxic and should be handled with care. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Zanzibar Red is grown primarily for ornamental foliage, not harvest. Seeds mature in spiky pods in late summer/fall; allow to dry on plant, then collect pods (wear gloves—seeds are toxic) for propagation. Remove seed pods to extend foliage season. Cut stems for dramatic arrangements; cut in early morning when fully hydrated.
Fun Facts
- 🌱 Zanzibar Red can grow 6-10 feet in a single season, making it one of the fastest-growing ornamental shrubs and a great choice for quick garden transformation.
- 🌱 The deep burgundy coloration intensifies with full sun exposure; plants grown in partial shade will display green leaves rather than the signature red hue.
- 🌱 Castor beans have been cultivated for over 4,000 years; ancient Egyptians used castor oil for lamps, cosmetics, and medicine, making Ricinus communis one of humanity's oldest crop plants.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Zanzibar Red planting timeline
Tell us your zip code and we'll calculate exactly when to start Zanzibar Red seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Zanzibar Red timeline →