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	Plant list: Indigo plants Use in a similar way to blue – to blur the gardens shape, and together with blue and violet for a lovely soft colour display.
	Eryngium x tripartitum Eryngium Perennial Hardy Blue Grey-green 1m to 1.2m x 50cm (3ft to 4ft x 2ft) A clump-forming perennial with wiry stems that branch. At the end of the branches are the conical thistle-like flowers, which can be dried. Prefers full sun.
	Related plant lists: Red plants Orange plants Yellow plants Green plants Blue plants Indigo plants Violet plants