Cape Primrose (Streptocarpus rexii)

Cape Primrose

Streptocarpus rexii

A charming woodland perennial with trumpet-shaped flowers, bringing a touch of the South African forest floor indoors; other names: Rex's Streptocarpus.

Prefers bright, indirect light or dappled shade; direct sunlight can scorch the leaves.
1/week
Moderate
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Plant Needs

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Sunlight Prefers bright, indirect light or dappled shade; direct sunlight can scorch the leaves.
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Watering Requires moderate watering; allow the top inch of soil to dry out between waterings to prevent root rot.
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Temperature Thrives in average room temperatures; not frost tolerant and dislikes extreme heat.
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Characteristics

  • Leaves: Rosette-forming, elongated, strap-shaped, with a wrinkled (rugose) texture, pubescent surfaces, and scalloped margins;
  • Flowers: Funnel-shaped or tubular, typically pale blue, lilac, or white with darker purple nectar guides in the throat, borne on slender leafless peduncles;
  • Fruit: A spirally twisted capsule that unwinds to release seeds, characteristic of the genus.
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Care Guide

Watering

Water thoroughly when the soil surface feels dry, ensuring good drainage.

Fertilization

Apply a diluted, balanced fertilizer to support new growth.. Feed regularly during the active growing season.

Banana Peel Tea:Steep chopped banana peels in water for 24-48 hours, strain, and dilute 1:1 with water. Apply to the soil to promote blooming. Discard solids in compost to avoid attracting pests.
Pruning
  • Snip off spent flower stalks at the base to encourage continuous blooming;
  • Remove yellowing, dead, or damaged leaves to maintain plant hygiene and appearance;
  • Divide overcrowded rosettes during repotting in spring to rejuvenate the plant.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Non-toxic to cats per ASPCA.

Humans: Non-toxic to humans.

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Garden Uses & Culture

Culture: Popularized in Victorian England, it became a staple of 19th-century glasshouses and conservatories, prized for its continuous blooms and shade tolerance.

Usage: Widely cultivated as an indoor flowering houseplant and used extensively in hybridization to create modern Streptocarpus cultivars.