Shortening days trigger dormancy. Long summer leaves blacken and wither as growth slows. Central crown staying green = healthy.
Grower in York, PA sees same pattern in September. Plants are healthy, just preparing for winter.
Christopher
Dwarf Pear Black Leaf Edges: Overwatering in Alkaline Soil
Dendrobium Phalaenopsis Yellow Leaves: It's Dormancy, Not Distress
Treating Sooty Mold on Magnolia Seedlings
Indoor Oregano Turning Black? It Needs the Outdoors
Ivy Sunburn: Why Moving a Hedera Ivy Outdoors Turned Leaves Black
Cherry Pouch Galls on Black Cherry: Cosmetic Mite Damage
Venus Flytrap Leaf Collapse and Browning After Cube Acclimation: Reset by Decapitation
Drosera capensis Black Leaf Tips: Aging, Transition, or Root Damage?
Venus Flytrap Leaves Turning Brown—Normal or Problem?
Black-Eyed Susan Leaf Scorch: Drought or Disease?
Water Lily Leaves Turning Black: Pot-Bound or Fungus?
Magnolia Branch Flagging: Black Twig Borer, Not Twig Girdler
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