Weeping Pussy Willow Half-Crown Dieback: Soil Test Needed

South-facing half of crown died after wet spring. No obvious damage or chemical exposure seen in photo.

Next Step

Conduct a soil test (free via county Cooperative Extension). It will reveal pH, N-P-K, and possible iron issues (you added Ironite). Local garden centers can also direct you.

Soil test is the best diagnostic tool when visual clues are absent.