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When to prune azalea

Within about 4 weeks after flowers fade. Flower buds for next spring form by midsummer, so prune within a few weeks after bloom and before about early July.

Typeshrub
Blooms onold wood
Bloom seasonspring
When to pruneWithin about 4 weeks after flowers fade
StopNo heavy pruning in the 6–8 weeks before your first fall frost

Avoid

Pruning after midsummer removes next year's flowers.

Also

Encore/reblooming types: right after the spring flush.

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Sources

Summarized in our own words from public extension publications.

All pruning timing