Category: A
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Sphagnum
A type of rather luxuriant growing moss, normally an inhabitant of boggy ground and much used when dried as an ingredient in potting mixes, especially for orchids. Live plants often grow from spores in the dried material, and are welcomed by orchid growers as a sign that conditions are right. Moss of the genus Sphagnum,…
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Self sow, self seed
A plant’s habit of shedding seeds around itself which germinate without the gardener’s assistance.
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Arbor
A structure, usually free standing, designed to be covered with climbing plants to provide shade. The term is more or less interchangeable with pergola. A structure, usually freestanding, designed to be covered with climbing plants to provide shade. The term is more or less interchangeable with pergola. A treelike structure. Arbor vitae cerebelli is the…
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Air-layering
A method of propagation applicable to a wide range of trees and shrubs which involves wounding the stem and then packing the wound with damp sphagnum moss. This is all held in place with string and plastic. When roots show, the new plant can be severed and transplanted. A method of propagation applicable to a…
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Anslinger, Harry J
As first commissioner of the US Treasury Department’s Federal Bureau of Narcotics, from 1930 to 1962, he was largely responsible for cannabis prohibition in the United States. Anslinger was a government civil servant from 1918 to 1963 and served under nine presidents.
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2-arachidonoylglycerol (2-AG):
Endogenous ligand of cannabinoid receptors CB1 and CB2; acts much like CBD.
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Marsh
An area of vegetation on wet ground on mineral soil (not on peat).
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Awl-shaped leaf
A leaf tapering from a cylindrical base to a fine point.
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Arrow-shaped leaf
A wide-based leaf, tapering to a point above, with two backward-directed pointed or rounded basal lobes.
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Alternate leaves
Leaves alternating up a stem, occurring first on one side, then on the other. Springing, one by one, from first one side of the stem and then the other. Whether the leaves are alternate or opposite is an important aid in plant identification.