Gray-brown, dried leaves on a lilac planted in June (hot, dry) are classic transplant shock—leaves developed in shade/nursery, then hit full sun. The plant bloomed and grew, so roots are working.
It should recover and leaf out normally next spring.
Combating Camellia Dieback and Canker with Pruning and Fungicides
Viburnum Leaf Beetle Devastating Snowball Bushes
White/Gray Leaves on Japanese Red Maple: Need Photo
Lilac Leaf Spots and Curl: Need Photo for Accurate Diagnosis
Dwarf Magnolia Mortality Assessment: Scratch Test and Basal Inspection
Lilac Curled Leaves with Black Powder: Aphids and Sooty Mold
Forsythia Sudden Stem Death: Transplant Shock or Herbicide?
Scale Insects Masquerading as Fungus on Lilac
Evergreen Bush Rust Color: Spider Mite Confirmation and Treatment
Roundup Drift on Lilacs: Recovery Possible
Yellow Leaves with Holes: Insects, Watering, and the Two-Knuckle Test
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