In the manner or pattern of a garland; arranged or decorated in a garland-like fashion.
From garland plus -wise (suffix meaning 'in the manner or direction of'), creating an adverb that describes how something is done or arranged.
The -wise suffix is ancient (from Old English 'wisa'), and it lets us describe direction or manner—'clockwise,' 'likewise,' 'garlandwise' all describe a particular orientation or method.
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