Not only is sage (Salvia officinalis) high in vitamins, according to the Alabama Cooperative Extension, but chefs commonly use the plant's pungent foliage as seasoning in various culinary entrees. Sage also makes a lush ornamental shrub thanks to its blue flowers. Regular trimming and pruning helps the sage plant maintain its vigorous growth.
Pinch back the sage plant during its first growing season after planting. Use your thumb and forefinger to snip off the growing tips of the sage's branches. This encourages a more dense, multi-branched shrub and more prolific flowering, according to the Alabama Cooperative Extension.
Prune the sage in the spring of its third year, according to Purdue University, and every spring thereafter. This helps keep the plant from becoming too woody. Woody plants don't produce as much foliage and blossoms. Measure a third of the plant's branch, starting from its growing tip.
Identify a leaf node nearest the 1/3 mark. A leaf node is the bump on the branch where leaves sprout. Cut off the end of the branch just past the leaf node. New foliage will sprout from the node, helping to keep the sage productive and growing strong.
Discard all removed vegetation or chop it into inch-long pieces and add it to your compost pile.