How To Grow and Save Seed of Cactus

This cactus mix contains two to three varieties: Opuntia microdasys, Thelocactus setispinus, and Mammillaria fraileana. Cacti are very slow to grow. However, they will live for many years and are very rewarding to grow.




Ornamental. Excellent houseplants.



  • The seeds are small, and contrary to how mature cactus-like to grow, they require high humidity and regular moisture to germinate.
  • Ideal germination temperature is 70-75 F.
  • Sow seeds in spring, water trays regularly, and consider covering trays in plastic wrap to trap humidity.
  • The seeds should germinate in 7-21 days.



Once the seedlings have grown past the cotyledon stage, plants can sit in bright, indirect sunlight. Water plants about once a week, allowing soil to dry between waterings.



No particular pests or diseases. Take care not to overwater as they will rot with too much moisture.



  • Seeds can be harvested by hand (wear gloves or use tweezers!).
  • Allow cactus to bloom and fade; there will be a small fruit or seed capsule left over, you can allow it to dry completely, or harvest the fruit when young. If harvesting while young, just squeeze the seeds out onto a paper towel to dry and carefully shake the dried seeds into a sealed container.
  • Store in a cool, dark, dry place.