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These annuals begin blooming in the early spring season and continue through most of the summer. In milder climates, they will keep going from autumn through the winter months. In hotter areas, look for heat-resistant plant cultivars and plant them in moderate shade.How tall do salvias get? The tall herbaceous varieties of salvia form nice clumps and can grow up to 3.3ft (1m) every year. The shrubby varieties of salvia grow much more slowly and are easily pruned to keep them in shape.