Lavender is often treated as a 'plant-it-and-forget-it' staple, but July is when it may need some extra care.
By mid-summer, most varieties are in full bloom, pollinators are busy working the flower spikes, and the plant itself is putting its energy into flowering rather than leafy growth. What you do now will directly affect how healthy it looks for the rest of the season – and how well it performs next year.