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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.
	Centurea montana Knapweed Perennial Hardy Indigo Mid-green 50cm x 60cm (1.5ft x 2ft) A spreading perennial that can look a little untidy, with flower spikes that don’t look strong enough for the job. The star shaped flowers which appear above the foliage however, are very fetching. Also available in pink and white. Prefers full sun.
	Related plant lists: Red plants Orange plants Yellow plants Green plants Blue plants Indigo plants Violet plants