Your container-grown 'Firecracker' salvia is skinny. Yes, cut it back by half. This stimulates lateral branching—exactly like you do with coleus. The plant will become denser and produce more flower spikes.
Removing the apical meristem (tip) releases lateral buds from apical dominance. Many annuals and perennials respond this way: petunias, dahlias, zinnias, snapdragons, even tomatoes.
'Firecracker' salvia has stunning scarlet blooms. Pinching ensures a full, floriferous plant all season.
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