Old English scrybb "brushwood, shrubbery," a rare and late word (but preserved also, perhaps, in Shrewsbury), possibly from a Scandinavian source (compare dialectal Danish skrub "brushwood," Norwegian skrubba "dwarf tree"). Presumably related to North Frisian skrobb "broom plant, brushwood;" West Flemish schrobbe "climbing wild pea," with a base notion of "rough plant," from PIE *(s)kerb-, extended form of root *sker- (1) "to cut."
word-forming element making nouns meaning "place for, art of, condition of, quantity of," from Middle English -erie, from Latin -arius (see -ary). Also sometimes in modern colloquial use "the collectivity of" or "an example of."
<a href="https://www.etymonline.com/word/shrubbery">Etymology of shrubbery by etymonline</a>
Harper, D. (n.d.). Etymology of shrubbery. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/shrubbery