Scarlet Ball Cactus (Notocactus haselbergii)

Scarlet Ball Cactus

Notocactus haselbergii

Its fuzzy spines frame bright scarlet blooms, a desert gem compact enough for windowsills. Globular succulent.

Full sun
0.5/week
Beginner
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Plant Needs

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Sunlight Full direct sunlight for most of the day; tolerate partial shade during extreme midday summer heat
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Watering Allow soil to dry completely between waterings; avoid overwatering to prevent root rot
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Temperature Thrive in warm, dry conditions; tolerate brief light frosts down to 5°C but avoid prolonged cold exposure
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Characteristics

  • Leaf: Modified into short, silver-white radial spines with reddish central spines; no true foliage leaves
  • Flower: Bright scarlet, funnel-shaped blooms up to 5 cm wide, emerging from the plant crown
  • Stem: Globular, green, covered in dense, fuzzy spine clusters
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Care Guide

Watering

Water deeply when soil is fully dry; reduce frequency if ambient humidity is high

Fertilization

Diluted cactus-specific feed once monthly. Use low-nitrogen, high-phosphorus feed to support blooming

Eggshell powder top dressing:Crush dried, rinsed eggshells into fine powder; sprinkle lightly on the soil surface to add calcium without burning roots
Pruning
  • Remove dead flower stalks to maintain a neat, compact appearance
  • Trim any damaged or rotting stem sections with sterile pruning tools
  • Repot only when root-bound; avoid frequent disturbance to the shallow root system
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no known adverse effects

Humans: No known toxicity to humans

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental succulent for indoor windowsill displays and arid rock gardens