English
gardenage
From garden + -age.
Formed from garden + -age
Proto-Indo-European *gʰerdʰ- ‘to enclose’
…
Proto-Germanic *gardô ‘hedge, fence; enclosure’
Frankish *gardō ‘enclosure, yard’
Anglo-Norman gardin
Middle English gardyn
English garden
Today it means
noun The set of activities pertaining to gardening, including design, planting, cultivating species, etc.; horticulture.
Language periods are conventional ranges, not dates for this word.
Etymograph / gardenage