Third person singular or plural present tense of 'clematise,' meaning to trim, prune, or treat clematis vines or to cultivate them in a garden setting.
From clematis plus -ise (British spelling of -ize), converting the plant noun into a verb meaning to work with or cultivate clematis plants. Created by gardeners to describe the specific actions involved in managing clematis.
Gardeners invented this verb because clematis requires such specific care—clematising involves careful pruning practices that differ by clematis type, making it precise enough that gardeners needed their own word for the task.
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