Set the potted ocotillo seeds on a propagation mat set to 95 degrees F. Lower the heat to 70 degrees F at night. Expose the seeds to at least nine hours of direct sunlight per day. Maintain light moisture in the sand to a depth of 1 inch. Watch for germination in eight to 15 days. Keep the pots on the propagation mat for one week after sprouting. Move the pots outdoors to a bright, sunny spot with good air circulation. Decrease water to no more than 1/4 cup every 10 to 14 days once the ocotillo seedlings reach 4 inches in height.