The Christmas cactus will adapt to low light conditions, but the plant will produce blooms more readily if exposed to brighter light. Too much direct sunlight can burn its leaves, so keep the Christmas cactus in an appropriate area to avoid this. Christmas cactus moisture is important as well. The plant requires frequent and thorough watering, during its active growth in spring and summer, keeping the soil slightly moist. Allow Christmas cactus moisture levels to drop and dry out some between watering intervals, but never completely, and never let the plant sit in water, as this will lead to root and stem rot.