Tulip poplars drop yellow leaves in June whenever stressed—by drought or excess water. It's a species trait, not a sign of dying. The tree will leaf out normally next spring.
See detailed watering instructions for trees.
Tulip poplar leaf in June
Planting Tulip Poplar in Kansas: Aphid/Scale Risk Assessment
Mature Poplar Progressive Decline: Internal Decay Management
Tulip Tree Troubles: Sapsucker Damage and Basal Decay
Recurring Aphids on Tulip Poplar: Stress Signals and Atomic Grow Root Drench
Disc Fungus on Tulip Poplar Stump: Decay Fungi Fruiting Bodies
Managing Poplar Suckers: Let One Grow, Skip Root Cutting, and Accept Shade-Tolerant Groundcovers
Poplar Root Suckers in Lawn: Can You Cut Roots Without Killing the Tree?
Tulip Tree Branch Dieback: Water and Mulch for Recovery
Poplar Root Suckers: To Separate or Not?
Identifying a Mystery Tree: White or Grey Poplar
Saving a Rotting Poplar: Fertilization for Structural Longevity
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