Hydrangeas and salvia no blooms, why ?
This sounds like a nutrient issue! Too much nitrogen, and not enough phosphorus and potassium can cause this. Alternatively, too low of a pH can cause this.
A lack of flowers on the plant is often an indication of insufficient sunlight. To ensure consistent blooming, it is essential to plant salvias in an area that receives full sun, about 5-6 hours a day. Insufficient watering can also cause reduced blooms.
A late or patchy frost can kill hydrangea flower buds or stems. You should also last fertilize with a slow release fertilizer 3 months before your average date of first frost; otherwise, the plant may be in grow mode when early frosts arrive and these can kill the flower buds. Too much nitrogen in nitrogen rich fertilizers may also reduce or eliminate blooms. Be mindful that hydrangeas like yours develop spring 2023 flower buds in the summer. They also break dormancy in stages: new spring stems grow first and leafless stems may leaf out as late as the end of spring in late June. Consider winter protection if the plants are always having difficulty blooming in spring.