"Large shrubs" refers to plants that are bigger than typical or small-sized shrubs, but not as tall or large as trees. They are medium-sized plants with thick stems and many branches. Full definition
Laurus nobilis is an aromatic evergreen tree or large shrub with green, glossy leaves, native to the Mediterranean region. (eol.org)
Ney Street Neighborhood Watch will plant large shrubs on strip of barren, rock solid, garbage strewn land on the 700 block of Alemany Boulevard. (sfenvironment.org)
All four major species of Hamamelis are tolerant of partial shade and valued as large shrubs or small trees that flower when few other plants are in bloom. (finegardening.com)