Brain Cactus

Common Name: Brain Cactus, Wave Cactus
Botanical Name: Stenocactus multicostatus
Type: Small globular cactus
Hardiness Zone: USDA 9–11
Growth Habit: Compact, ribbed globe (2–4 inches wide), slow-growing

☀️ Light

Bright, direct sun is essential.

• Outdoors: Full sun to partial shade.

• Indoors: South-facing window preferred; supplement with a grow light if light is insufficient.

💧 Water

Water infrequently—this cactus thrives on neglect.

• Spring/Summer (growing season): Water when the soil is bone dry, typically every 2–3 weeks.usually sufficient.

• Fall/Winter (dormant): Water once every 4–6 weeks or not at all.
  💀 Overwatering = root rot.

🪨 Soil

Use a gritty, fast-draining cactus mix.
Amend with extra perlite, pumice, or coarse sand to boost drainage.

🌡️ Temperature & Humidity

• Heat-tolerant, frost-sensitive.

• Ideal temps: 70–90°F during the day, not below 50°F at night

• Avoid humidity—this desert native prefers dry air.

🪴 Potting & Repotting

• Use a clay or terracotta pot with drainage holes

• Repot every 2–3 years, or when roots outgrow the pot.

🌸 Flowering

Produces small, lavender to pinkish-white flowers in spring and early summer.
Encourage blooms with lots of sun and a dry winter rest period.

☠️ Toxicity Warning

Non-toxic to humans and pets—but those spines are sharp. Handle with care!

🌱 Propagation

• Primarily via seeds—offsets are rare.

• Sow in warm, dry conditions

• Be patient: germination is slow, and growth is even slower

🚫 Pests & Problems

• Root rot from overwatering

• Occasional mealybugs or spider mites

• Ensure good airflow and dry conditions to prevent fungal issues

☠️ Lifespan Overview

• ☠️ Can live 15–30+ years with proper care. It's a long-term desert companion.

💡 Pro Tips

• Rotate the pot monthly to prevent lopsided growth.

• Don’t water at all during cold snaps.

• Use long tweezers or tongs for handling.

• Let it sunbathe outside during summer, but protect from rain..