 |  |  | 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. |
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 | |  |  | | 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. |
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