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9cm Nepetas

in Plants
I've got three 9cm pots of Nepeta. I know they're a tough plant but are they tough enough when small to be planted outside now or should I hold off and wait for spring?
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I often leave hardy plants that size out, but only against a wall, or in among shrubs, or similar, and if they've been growing in my garden for the previous 6 months or so. That allows them to experience everything the climate throws at them over winter, but with enough exposure.
I live in west central Scotland - not where that photo is...