How To Get Petunias To Bloom May 2026

Petunias are the workhorses of the summer garden. When happy, they don’t just bloom—they erupt in a kaleidoscope of trumpets, spilling from hanging baskets, edging borders, and carpeting flower beds. Yet, a common gardener’s lament is the “petunia slump”: a once-thriving plant that turns into a leggy, yellowing mess with just a few sad flowers at the tips.