Answer: You can keep your salvia looking terrific if you deadhead when the flowers are spent. Deadheading promotes a longer bloom period; snip off spikes to side branches; cut stems back to the basal foliage to encourage a late-summer rebloom. Marigolds will benefit from deadheading, as well. They are annual plants, with the sole purpose of flowering and setting seeds. Once they've set seeds, they will die. The best way to keep them flowering over the longest period possible is to pinch or prune off the flowers just as they start to age, but before they have a chance to set seeds.
Best wishes with your lovely garden!
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