500 Obregonia Denegrii (Artichoke Cactus) Seeds Growing Information: Seeds should be germinated in a fine sandy soil at about 70-75 degrees. A commercial potting mix with the larger material strained out is ideal. Flatten out the soil and then put a thin layer of loose soil above it. Sow the seeds on the surface. They need light to germinate. Mist the soil to keep it moist and cover with clear plastic. The soil should not be allowed to dry out while the plants are seedlings. Use a mister if the soil does get dry. Place the seedlings in bright light. Placing the seeds just a few inches from fluorescent lights is ideal for starting seedlings, although natural light will work too Be sure to air out the seedlings once a day for best results