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|Unless you have a heated greenhouse, it's best to sow cactus seed in the late spring.
1. Use a mixture of potting soil and sand. Firm down and make the surface level. Remember that cacti roots must have a well-draining porous soil which can easily be re-moistened. Some commercial potting soils have been developed specifically for cacti.
2. Scatter your mixed cactus seeds over the surface of the compost, taking care not to sow them too thickly. Sow them just enough sand to anchor them.
3. Gently sprinkle a thin layer of silver sand over the seeds, covering the whole surface of the compost. Dampen the soil enough to wet the seed. When the soil dries out completely, use a mister to keep it moist. Do not over water.
4. Leave the pot in a greenhouse or on a warm windowsill, covered with a sheet of glass and a layer of paper. Make sure to wipe away any condensation that may form.
5. Remove the glass once seedlings develop - these will be large enough to prick out by next spring. Place the seedlings in light, but not in direct sunlight. Keep temperatures around 70 degrees F (21 degrees C).
6. Next spring, gently tease out individual cacti, and plant out in a tray of gritty compost. Water well.
7. As they grow taller, carefully transplant some of the larger cacti into bigger pots to give them room.
8. Finally, plant individually into small terracotta pots. Water and feed, and repot annually as they grow.