Classic aphid or thrips damage. These pests attack tender new growth, sucking juices and distorting internal leaf structure. As leaves mature, they emerge deformed. By fall, the pests are gone (killed by frost), but damage is done.
Prevention: In early summer, spray with Ortho Systemic Insect Killer (acephate) to protect fall foliage.
Excessive old leaves (14 flower stalks suggests vigor, but brown pitchers indicate lack of maintenance). S. purpurea leaves last ~18 months. Remove old/browning leaves in early summer as new growth appears. By fall, only current-season leaves should remain. This improves airflow, reduces crowding, and prevents deformation.
Rule of thumb: Trim any leaf you can't stand looking at.
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