How to Grow Watsonia
Watsonia
Watsonia borbonica
flowerWatsonia borbonica is a striking South African corm-forming perennial that produces tall spikes of vibrant red, pink, or orange tubular flowers. Also called Bugle Lily, it's an elegant addition to borders and cutting gardens, known for its dramatic vertical growth and long-lasting blooms. The plant naturalizes well in Mediterranean and warm-temperate climates.
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Example Watsonia timeline · Pittsburgh, PA (Zone 6b)
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Plant Watsonia
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 Watsonia blooms
Around Oct 14≈ 180 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Watsonia dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in USDA zones 8b-11; prefers mild winters and moderate summer heat
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Dormancy & Planting
6-8 weeks before sproutingCorms are planted in autumn as the soil begins to cool. No visible growth occurs initially.
Plant in autumn (September-November in Northern Hemisphere). Ensure excellent drainage. Store dry corms in cool, dark location before planting.
Vegetative Growth
3-4 monthsSword-like green leaves emerge in winter and spring, forming dense clumps of upright foliage.
Water moderately as leaves develop. Apply balanced fertilizer in early spring. Remove any dead leaves. Provide support stakes if needed in windy locations.
Flowering
4-8 weeksTall flower spikes (2-4 feet) emerge from the foliage, lined with tubular florets that open progressively from base to tip. Colors include red, pink, orange, and coral.
Cut flowers for arrangements to encourage more blooms. Deadhead spent flowers to extend blooming period. Provide afternoon shade in extremely hot regions. Water regularly but don't overwater.
Seed Set & Decline
4-6 weeksOnce flowers fade, seed pods form if not deadheaded. Foliage begins to yellow and decline as the plant enters dormancy.
Allow seed pods to develop only if desired for propagation; otherwise deadhead to conserve corm energy. Gradually reduce watering as foliage fades.
Summer Dormancy
3-4 months (June-September in Northern Hemisphere)Foliage completely dies back; corms rest underground. Plant appears dormant and dead.
Withhold water; keep dry. Do not dig or disturb corms. Apply light mulch to protect from extreme heat and prevent erosion. In cold climates, lift corms and store indoors.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with neem oil or insecticidal soap during active growth; remove affected flowers; encourage beneficial insects
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Increase humidity; spray foliage with water; use miticide if severe
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Ensure excellent drainage; avoid overwatering; remove infected corms immediately; treat with fungicide if caught early
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Use protective corm barriers; maintain garden hygiene; set traps if necessary
Uses
Ornamental Flower Arrangements
CulinaryWatsonia flowers are prized as cut flowers for fresh floral displays and wedding arrangements, lasting 7-10 days in water. Their tall, dramatic spikes add vertical interest and vibrant color to bouquets. [source]
Garden Focal Point & Border Accent
HouseholdThe striking vertical spikes serve as excellent focal points in gardens, borders, and landscape designs. Plant in groups for dramatic mass effect or as standalone specimens. [source]
Pollinator Attraction
WildlifeThe tubular flowers attract hummingbirds, sunbirds, and other pollinators, making Watsonia an excellent choice for pollinator gardens. [source]
Dried Flowers & Seed Pods
CraftSeed pods and dried flower spikes are used in dried flower arrangements and craft projects. Allow flowers to dry on the plant or harvest and air-dry indoors. [source]
Traditional Uses
MedicinalIn South African traditional medicine, Watsonia corms have been used in various preparations, though modern medical validation is limited. The plant should not be ingested without proper guidance. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Cut spikes when the lowest 2-3 florets begin to open; they will continue opening in the vase over several days. Harvest in early morning for best vase life (7-10 days). Remove lower leaves below the waterline to prevent rot.
Fun Facts
- 🌱 Watsonia borbonica is native to South Africa and was named in honor of Sir William Watson, an 18th-century English botanist.
- 🌱 The plant is sometimes called 'Bugle Lily' because its tubular flowers resemble bugle horns, and it was once considered invasive in Mediterranean climates due to prolific self-seeding.
- 🌱 In frost-free regions, Watsonia can bloom multiple times per year if provided with adequate water and fertilizer between flowering cycles.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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