Princeton's WordNet

1. gardening, horticulture(noun)

   the cultivation of plants

Kernerman English Learner's Dictionary

1. gardening(noun)ˈɑɑrdənɪŋ

   the activity of taking care of a garden

   a gardening magazine

Wiktionary

1. gardening(Noun)

   horticulture

2. gardening(Noun)

   the process or action of cultivating of the soil particularly in a garden; the care of a garden.

   His hobby was gardening.

3. gardening(Adjective)

   describes items or actions connected with the garden.

   He had just entered the house and was wearing his gardening clothes.

Origin: garden + -ing

Webster Dictionary

1. Gardening(u)

   of Garden

2. Gardening(noun)

   the art of occupation of laying out and cultivating gardens; horticulture

U.S. National Library of Medicine

1. Gardening

   Cultivation of PLANTS; (FRUIT; VEGETABLES; MEDICINAL HERBS) on small plots of ground or in containers.

• tuinmaakAfrikaans
• بَسْتَنَهArabic
• градинарствоBulgarian
• jardinagemPortuguese (BR)
• zahradničeníCzech
• die GartenarbeitGerman
• havearbejde; have-Danish
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• aiatöö, aiandusEstonian
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• 庭いじりJapanese
• 원예Korean
• sodininkavimasLithuanian
• dārzkopība; dārzkopības-Latvian
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• hagestell/-bruk; hage-Norwegian
• ogrodnictwoPolish
• باغبانیPersian
• باغوانیPashto
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• (de) gră­di­năritRomanian
• садоводствоRussian
• záhradníčenieSlovak
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• trädgårdsarbete, -skötselSwedish
• การจัดสวนThai
• bahçe işleri, bahçıvanlıkTurkish
• 整理花草樹木Chinese (Trad.)
• садівництвоUkrainian
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• 园艺Chinese (Simp.)