late 13c. (late 12c. in surnames), from Old North French gardin "(kitchen) garden; orchard; palace grounds" (Old French jardin, 13c., Modern French jardin), from Vulgar Latin *hortus gardinus "enclosed garden," via Frankish *gardo or some other Germanic source, from Proto-Germanic *gardan- (source also of Old Frisian garda, Old Saxon gardo, Old High German garto, German Garten "a garden," Old English geard, Gothic gards "enclosure"), from PIE root *gher- (1) "to grasp, enclose." Italian giardino, Spanish jardin are from French.
As an adjective from c. 1600. Garden-party "company attending an entertainment on the lawn or garden of a private house" is by 1843. Garden-variety in figurative sense first recorded 1928. To lead someone up the garden path "entice, deceive" is attested by 1925. Garden-glass "round dark glass reflective globe (about a foot and a half across) placed on a pedestal, used as a garden ornament," is from 1842.
It forms all or part of: Asgard; carol; choir; choral; chorale; choric; chorister; chorus; cohort; cortege; court; courteous; courtesan; courtesy; courtier; curtilage; curtsy; garden; garth; gird; girdle; girt; girth; -grad; hangar; Hilda; Hildegard; Hortense; horticulture; jardiniere; kindergarten; Midgard; orchard; Terpsichore; Utgard; yard (n.1) "patch of ground around a house."
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit ghra- "house;" Albanian garth "hedge;" Greek khortos "pasture;" Phrygian -gordum "town;" Latin hortus "garden;" Old Irish gort "field," Breton garz "enclosure, garden;" Old English gyrdan "to gird," geard "fenced enclosure, garden," German Garten "garden." Lithuanian gardas "pen, enclosure," Old Church Slavonic gradu "town, city," and Russian gorod, -grad "town, city" belong to this group, but linguists dispute whether they are independent developments or borrowings from Germanic.
ornamental flower stand, 1841, from French jardinière "flower pot" (also "female gardener, gardener's wife"), noun use of fem. of adjective jardinier "of the garden," from jardin "garden; orchard; palace grounds," from Vulgar Latin *hortus gardinus "enclosed garden," via Frankish *gardo or some other Germanic source, from Proto-Germanic *gardaz, from PIE root *gher- (1) "to grasp, enclose."