Growing Cattleyas in Rock Medium: Grow Rock and Pot-in-Pot Method

Grow Rock

Porous fired rock ("grow rock") retains nutrients and air. Santa Barbara Orchid Estate may use this.

Placing a smaller pot inside a larger one allows root expansion with minimal disturbance during repotting.

Rock is inert—provides no nutrients. Standard fir-bark mix with perlite/charcoal is preferred for nutrition and moisture management.

Orchids: Growing Cattleyas in Transparent Pots: Root Photosynthesis Benefits; Root Photosynthesis in Orchids: Cattleyas and Other Epiphytes; White Fuzzy Spots in Phalaenopsis Pot: Perlite, Not Pests—And Repotting Rotten Roots; Phalaenopsis Black Roots After Repotting: Bad Media, Red Water, and Emergency Media Switch; New Oncidium, White Mold in Mix: Repotting Guide for Beginners; Cattleya Root & Rhizome Wrinkling: Rest Periods, Humidity & Repotting; Getting More Blooms from Potted Roses in Karachi's Heat; Persistent Sewer Roots After Tree Removal: Chemical Control; Finding Large Pumice Stones for Mounted Pinguicula in Southern California; Growing Edible Ginger from Grocery Root

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