Re-plant clivia only if the roots fill up the pot and there is very little soil left. They may only need to be repotted every 5 years or longer. Re-pot only when the roots fill up the pot and repot into a pot only 1 to 2 inches larger than the one in which it is currently growing. Use a mixture of one part potting soil, one part peat moss and one part sand.
Grow clivia in a north-facing window in the house during the winter months. It can grow in an east or west facing window that receives some shade from the direct sun.
Water clivia plants only when the soil is completely dry. Poke your finger into the soil. It should feel dry to the touch 2 inches below the surface. Thoroughly saturate the soil, watering until it runs out of the bottom of the pot. Allow all the excess water to drain out, then empty the drip tray underneath; do not let clivia sit in standing water.
Stop watering them beginning in October. Keep them dry for a period of 12 to 14 weeks. Do not water unless your plant start to wilt. If it does, give it only 1 to 2 cups of water. This mimics the natural dry season in its native jungle.
Begin watering thoroughly again in early to mid January. Water until it runs out of the bottom of the pot. After all of the water drains out, empty the drip tray under the pot. Your clivia should bloom in approximately 6 to 12 weeks.
Cut off the flower stalk at soil level after the bloom fades.
Begin fertilizing after the flower finishes blooming. Use a general all purpose fertilizer that you dissolve in water before applying. Mix it at half of the manufacturer's recommended rate of application. Apply fertilizer monthly. Add it directly to the soil the day after you thoroughly water the plant.
Move your clivia outdoors after all danger of frost has past. Keep it in a location that is shaded all day long. Bring it back indoors in fall before frost.