King Protea (Protea cynaroides)

King Protea

Protea cynaroides

Its giant flower head is a crown of wild South African grandeur. Evergreen woody shrub; common name: King Sugar Bush.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Requires full sun for optimal flowering; tolerates light partial shade in extremely hot climates to prevent leaf scorch
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Watering Water deeply but infrequently; allow the top 5–10 cm of soil to dry completely between waterings to avoid root rot
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Temperature Thrives in 10–25℃; can tolerate short periods of light frost (down to -2℃) when established
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Characteristics

  • Leaf: Leathery, oblong to elliptical leaves arranged in dense rosettes at branch tips; dark green with smooth margins
  • Flower: Large bowl-shaped inflorescence (up to 30 cm diameter) with layered, colorful bracts ranging from pale cream to deep pink
  • Stem: Woody, branching stems with rough, brown, fissured bark
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Care Guide

Watering

Increase watering frequency during active growth periods; ensure soil drains freely to prevent waterlogging

Fertilization

Apply diluted low-nitrogen, phosphorus-rich fertilizer once every 6 weeks. Avoid high-nitrogen fertilizers, which can inhibit flower production

Eggshell powder topdressing:Crush thoroughly dried eggshells into a fine powder; sprinkle a thin layer on the soil surface around the base of the shrub; avoid direct contact with stems to prevent irritation
Pruning
  • Remove spent flower heads after blooming to redirect energy to new growth and encourage subsequent flowering
  • Thin overcrowded inner branches in late winter to improve air circulation and reduce fungal disease risk
  • Trim back leggy or damaged stems in early spring to maintain a compact, rounded shrub shape
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: National flower of South Africa; symbolizes courage, transformation, and natural grandeur

Usage: Popular cut flower for high-end floral arrangements; ornamental garden shrub in suitable climates