Once the salvia has been deadheaded, water it to give it an extra boost. Now is also a good time to fertilize; Elixir Gardens high potassium liquid fertilizer available at Walmart will increase the chance of the salvia producing healthy blooms in future. This should also be done midsummer to encourage an additional bloom cycle.
Jacky Chou also suggests, 'Deadheading, along with good practices, can help keep your salvia plants looking healthy and blooming beautifully throughout the season. Remember to provide adequate care for your salvia, including regular watering, proper sunlight exposure, appropriate soil conditions.'