How to Raise Trichocereus Peruvianus Cactus From Seeds

Fill a plant pot to within 2 inches of the rim with commercial cactus soil. You can make your own cactus blend by mixing 2 parts white pumice, 1 part coarse sand and 1 part compost. The Desert Botanical Garden suggests mixing equal portions of potting soil and either perlite, granite or pumice to make a seed starter for cactus.

Water the soil thoroughly until water runs through the bottom of the pot and let it set until it is fully drained. Although cactus typically do not require moist soil, the seeds need moisture to germinate.

Sprinkle the seeds over the top of the soil. Cover with a fine layer of sifted cactus soil or fine sand. Cover the pot with plastic food wrap or other clear plastic lid. The cactus seeds need light to germinate.

Place the newly planted seeds under a full spectrum plant light, approximately 6 to 8 inches beneath the light. Maintain the temperature between 70 and 90 degrees Fahrenheit. Although your seeds may germinate on a sunny windowsill, a plant light is recommended and makes it easier to control the temperature.

Keep the soil slightly moist until seedlings appear in three to five weeks. Remove the plastic cover and prop the seedlings with a small piece of pumice or granite, if necessary. Continue to keep the soil moist for the next six months and gradually reduce watering to every three to five days, allowing the soil to dry slightly before watering again.