Mulch Lightly to Suppress Weeds
Weeds are a real threat in a petunia field, especially early in the season before the plants fill in. A light layer of mulch—like straw, shredded leaves, or compost—can help suppress weeds, retain moisture, and regulate soil temperature without suffocating the shallow-rooted petunias.
Just be sure not to pile mulch around the base of the plants, which can invite rot. Mulch also provides shelter for beneficial insects like ground beetles and native solitary bees, who might nest nearby and help keep pest populations in check. It’s a win for plant health and biodiversity alike!