Answer: Oriental Lilies have three basic cultural requirements: deep, loose, well-drained soil, ample moisture year round (plants never completely stop growing); coolness and shade at the roots, and sun or filtered shade at the tops where flowers form. Now that the flowers are spent you can cut down the flower stem. After the tops yellow and die, cut the foliage down to ground level. New leaves will form next spring. You can add a layer of mulch over the plants during the winter months but gently rake it back in the spring before new leaves sprout. Eventually your lilies will form clumps which can be divided during the dormant season. Use a garden fork to lift the clumps, then separate them into smaller clumps before you replant. Good luck with your lilies!
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