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Refers to water collected and distributed via irrigation trenches located beneath the surface of garden beds.
Any plant that grows either completely submerged in, or with leaves and flowers emerging from, water. It may be rooted in the soil or compost under water, or be free floating.
An aquatic plant, which, when submerged, releases oxygen into the water.
The inability of a seed to germinate, particularly when there's been a lack of water.
A complex single cell organism that's common wherever there is water - oceans, lakes, ponds and soil.
A common term for any number of gnat-like flies, which are usually found close to water sources.
An organism, viral, bacterial, fungal or parasitical, that attacks plants. It may be water, air or soil borne, or carried by insects.
Decomposed organic matter that provides nutrients for plants and increases the soil's ability to retain water. Humus can be mixed with garden soil and sand to make a potting mixture.
The glacial land form, comprising gravely detritus and stratified drift found at the base and edges of a glacier, and usually with a flow of fresh water. Similar to the scree found at the base of mountains and cliffs.
A bulb-like swelling that occurs at the base of epiphytic plants, such as orchids, where nutrients and water are stored. It's not a true bulb.