How to Grow Pink Castor
Wikimedia Commons
Pink Castor
Ricinus communis var. pink
shrubPink Castor is an ornamental variety of the castor bean plant featuring striking pink or red-tinged foliage and stems. This tropical shrub grows rapidly and can reach 6-12 feet tall, making it an excellent statement plant for warm gardens. It is grown primarily for its dramatic foliage, though it also produces colorful seed pods.
When should you plant Pink Castor 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 Pink Castor timeline · Pittsburgh, PA (Zone 6b)
-
Plant Pink Castor
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Pink Castor
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Pink Castor dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 9b-11; grown as annual in cooler zones
Sign up free to see if Pink Castor grows in your zone — and get a personalized planting timeline.
Get my Pink Castor timeline →Growth Stages
Seedling
2-3 weeksEmerging seedlings with cotyledons and first true leaves appearing; foliage begins showing light pink tones
Provide bright light, maintain warm temperatures (70-85°F), and keep soil consistently moist but not waterlogged
Vegetative Growth
4-8 weeksRapid stem elongation with large palmate leaves becoming more pronounced; pink and red coloration intensifies in stems and leaf undersides
Provide ample sunlight for best color, thin seedlings to proper spacing, pinch tips to encourage bushiness if desired
Branching & Development
6-10 weeksPlant develops lateral branches creating fuller form; foliage becomes more deeply colored with prominent pink veining
Begin monthly balanced fertilization, maintain consistent watering, support tall stems if needed in windy locations
Flowering & Seed Pod Formation
8-12 weeksDense flower spikes appear at branch tips followed by spiky seed pods with striking coloration; foliage reaches peak color intensity
Continue regular watering and feeding; remove spent flower spikes if not desired for seed collection
Seed Maturation
4-6 weeksSeed pods dry and harden, becoming increasingly ornamental; foliage may become less vibrant as plant ages
Allow pods to mature on plant if collecting seeds; reduce watering slightly. In cool climates, bring indoors before first frost if keeping as houseplant
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Increase humidity, spray with water or neem oil; remove heavily infested leaves
-
Remove with rubbing alcohol on cotton swab; treat with insecticidal soap or neem oil
-
Scrape off manually; treat with horticultural oil or neem oil
-
Hand-pick in early morning; use beetle traps or neem oil spray
Uses
Tropical Garden Statement Plant
OrnamentalPink Castor serves as a dramatic focal point in warm-climate gardens and containers with its vibrant pink-tinged foliage and rapid growth. Its large palmate leaves and colorful stems create an instant tropical ambiance. [source]
Cut Foliage & Floral Arrangements
CraftThe striking stems and large leaves are excellent for fresh or dried floral arrangements, adding height and drama to bouquets and garden displays. [source]
Fast-Growing Privacy Screen
HouseholdPink Castor's rapid growth (up to 1 foot per month in warm conditions) makes it ideal for quickly creating a living screen or backdrop in summer gardens, especially in zones 9-11. [source]
Castor Oil Production
CulinaryWhile primarily ornamental, Pink Castor is a variety of Ricinus communis, the source of castor oil. The seeds contain oils historically used in traditional medicine and industrial applications, though handling requires caution. [source]
Pollinator Support
WildlifeThe flower spikes attract bees and other pollinators, supporting local insect populations while adding another ornamental dimension to the garden. [source]
Harvest Tips
Pink Castor is primarily grown for foliage, not harvest. Enjoy leaves and stems for floral arrangements once plant is 2-3 feet tall. If collecting seeds, allow pods to fully mature (turn brown/tan) on the plant, then collect before pods split open naturally. Wear gloves when handling seeds as they contain ricin and are toxic.
Fun Facts
- 🌱 Pink Castor can grow 6-12 feet tall in a single season in warm climates, making it one of the fastest-growing ornamental shrubs suitable for temperate gardens.
- 🌱 The distinctive pink coloration in stems and foliage intensifies with exposure to sunlight and cooler temperatures, creating even more dramatic display in the right conditions.
- 🌱 Despite being called 'castor bean,' the plant is not a legume—it's a member of the Euphorbiaceae family, and its seeds contain ricin, a toxic protein, making careful handling essential.
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Pink Castor planting timeline
Tell us your zip code and we'll calculate exactly when to start Pink Castor 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 Pink Castor timeline →