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Cut the dead or diseased stalk back to the base of the plant. Cut damaged stalks below the damaged part to leave the foliage to feed the plant. Prune the stalks back to the base of the plant in late fall when the lilies have stopped blooming and the foliage is dying off. Pruning shears.
Wait for the right time. If you decide to transplant tiger lilies while they are in bloom during spring and summer, clip off the flowers so the plant's energy goes toward storing food for the winter. However, transplanting is best in early fall when the leaves' foliage is yellowing or in late winter right before they begin to grow again.