My daughter is fascinated by cacti and especially clever at growing them from the leaves that fall off or from seed. This photo shows a small cactus grown from seed and two smaller ones, the size of peas, sprouting from it's stem.
A good close up of the plant. Amazing that it was grown from seed. I never thought of seeds for cacti. I never think much about cacti. Personally I don't like a prickly cactus as a plant but I inherited one from my brother who had it in his early 20's putting it close to 40 years old!