Opuntia robusta is widely available in the Southern United States and in Mexico. It is an attractive blue cactus and almost spineless.
Water generously when soil is dry.
Acid or alkaline
50% potting mix 50% non organic material (pumice or perlite).
Fish emulsion, kelp solution, worm casting, shrimp compost.
Pad cuttings or branch segments
INSTRUCTIONS FOR ROOTING CUTTINGS
Insert cutting into the soil (1" deep). When soil is dry, water the plant sparingly. Roots should form in the following two weeks. Plants should be in bright shade during the rooting period. To avoid leaves from getting burnt, acclimatize the plant to full sun.