Broadleaf arrowhead (Sagittaria latifolia) is a bog plant in the water plantain family. The plant thrives in wet soil or shallow water, especially on the banks of ponds, streams and marshes. It grows between 1 and 4 feet tall, preferring sun to partial shade. The broadleaf arrowhead has white flowers that bloom between July and September. They measure three-quarter inches across. The leaves are up to 16 inches long and are toothless and hairless. Prune broadleaf arrowhead annually to remove dead foliage, improve the plant's health and create a more desirable shape it.
Remove dead or dying foliage by hand or by cutting it off with pruning shears. Foilage will eventually fall off on its own, but can clog up the pond or water garden the broadleaf arrowhead is planted in.
Prune newly emerging plants to control the size and spread of the bog plant. Broadleaf arrowhead can get out of control and choke other plants. Trim off the ends of the branches, next to a bud, to create a bushier rather than spreading form.
Trim some leaves when the plant grows profusely, to avoid covering too much of the pond surface. Snip them off where they meet the branch.
Cut branches that are unproductive. Stringy stems are only sapping energy from the rest of the plant. Cut them off where they meet productive foliage.