Grafted Cactus (Moon Cactus Type): Why Repotting Is Rarely Needed

Graft Biology

• Rootstock (bottom): Provides roots, vascular transport. Usually Hylocereus or Myrtillocactus.
• Scion (top): Colorful mutant lacking chlorophyll. Cannot survive on own roots.
• Graft union prevents rootstock arms; scion stays globular.

Repotting Only If

• Pot cracks.
• Soil exhausted (3+ years).
• Rootstock rots (then scion dies too).

If Repotting

• Cactus mix; same depth.
• Spring/early fall.
• No water 1 week.

Enjoy as-is—these are temporary decorations (scion often dies in 2–5 years).