Regular deadheading ensures petunias will bloom all summer long. Most petunias will need to be deadheaded at least once a week. Adequate light, water, and fertilizer will also support prolific blooms.

In general, perennials don't need deadheading, but many can benefit from it. The frequency of deadheading depends on the plant and your gardening goals. Self-cleaning and re-seeding perennials don't ...