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Mammillaria scrippsiana

Hedgehog Cactus / Fishhook Pincushion

Complete Care Guide

☀️ Light & Temperature

Requires bright, direct sunlight (at least 6 or more hours of direct sun daily) to maintain a compact shape, dense spination, and healthy coloring. Place it directly in a south- or west-facing window indoors, or outdoors in full sun.

  • Light Requirements: Needs at least 6 hours of bright, direct sunlight daily to maintain compact shape and dense spination.
  • Temperature Range: Thrives in warm summer temperatures between 65°F–85°F (18°C–29°C). Moderately cold-hardy to about 20°F (-7°C) if kept bone dry.
  • Winter Rest: A cool, dry winter rest period (45°F–55°F / 7°C–13°C) encourages prolific blooming come spring.
  • Etiolation Alert: In low light, the cactus will stretch out and weaken. Gradually transition it to a sunnier spot.

    • 💧 Watering & Soil

    Excellent drainage and airflow are absolutely essential to prevent rot. Plant in a commercial cactus or succulent mix heavily amended with coarse sand, pumice, or perlite. Always use a pot with bottom drainage holes.

  • Soak and Dry Method: Drench the soil completely until water runs out the bottom, then allow it to dry out completely before watering again.
  • Winter Watering: Drastically reduce or suspend watering during winter. Give only a tiny splash once a month, or keep completely dry if kept cool.
  • Soil Mix: Use a gritty, fast-draining cactus mix with extra pumice or perlite. Ensure the pot has drainage holes.

    • 🌱 Feeding & Maintenance

    • Fertilizing: Feed lightly using a balanced liquid cactus/succulent fertilizer diluted to half-strength. Apply once a month during spring and summer. Do not fertilize in winter.
    • Repotting: Repot every 2 to 3 years in spring as new growth begins. These cacti prefer a slightly snug root setup. Wear thick gloves or use tongs to handle the spiky needles.
    • Grooming: Remove any dried or dead offsets at the base to keep the plant tidy and improve airflow.

    ⚠️ Common Troubleshooting

    • Soft, mushy, translucent stem (Root Rot): Caused by overwatering or poorly draining soil. Unpot immediately, trim away rotten roots, let healthy base callous for a week, and repot in fresh, dry, gritty medium.
    • Pale, elongated growth (Etiolation): The cactus needs more sunlight. Gradually transition it to a sunnier spot.
    • Wrinkled or shriveled body: If soil is bone-dry, the plant is dehydrated and will plump up after watering. If soil is wet, rot may have destroyed the roots.
    • Pests (Mealybugs): Look for white cottony tufts between tubercles. Dab with a cotton swab dipped in 70% isopropyl alcohol.

    Quick Summary

    ☀️ Light

    6+ hrs bright direct sun daily

    💧 Water

    Soak & dry, keep dry in winter

    🪺 Soil

    Gritty, fast-draining cactus mix

    🌡️ Cold

    Cold-hardy to 20°F if dry