growing medium
nounUK /ˈɡrəʊ.ɪŋ ˌmiː.di.əm/
US /ˈɡroʊ.ɪŋ ˌmiː.di.əm/
A growing medium is the stuff a plant's roots live in instead of soil.
The gardener filled the pots with a light growing medium so the seedlings could sprout.
RELATED WORDS
OTHER MEANINGS
2. In hydroponics, a material like clay pebbles or rockwool that holds roots while water carries the nutrients.
The hydroponic tomatoes were rooted in a growing medium of clay pebbles.
3. In mushroom farming, the material such as straw or wood chips that the fungus feeds on.
Oyster mushrooms grow best on a growing medium of pasteurized straw.
4. In tissue culture, a nutrient-rich gel that supports tiny plant pieces as they grow.
The lab placed the cuttings on a sterile growing medium in glass jars.