PRICKLY PEAR CACTUS Opuntia humilis
Type: Hardy perennial
Hardiness zones: 4-9
Location: Full sun
Seeds per pack: 5
Germination: Rub the prickly pear cactus seeds against a piece of sandpaper to scratch the seed coat. Scratched seeds germinate faster and more reliably than untreated seeds.
Press the seed into the soil and cover with a fine layer of soil, barely 1/8 inch thick. Mist the soil surface with a fine spray of water. Cover the tray with the plastic lid or put individual pots in plastic bags. Place the pots or tray in a sunny window or under artificial lights. Check the soil daily for moisture and temperature. Ideal soil and air temperatures for prickly pear cactus is 70 degrees. If heat builds up under the plastic, move the container or open the vent further to release excess heat. Water the soil as needed with a fine mist, keeping the soil moist but not wet. The seeds can germinate in as little as 2 weeks, or can take several months, with seeds being erratic germinators.