Sedum
Symptom Cause  
Leaves, stems dark, soft, rotted; shrivel, drop from plant
Leaf Spot
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Leaves, stems dark, soft, rotted; shrivel, drop from plant
Root Rot (fungus)
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Ragged holes in leaves; stems and leaves may be sheared and eaten
Slugs and Snails
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Leaves, stems dark, soft, rotted; shrivel, drop from plant
Stem Rot
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