We have found 11 plants that meet your criteria.

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columbine
Aquilegia vulgaris columbine Looks good in most settings £2.99 Buy
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cornflower
Centaurea cyanus cornflower A vivid blue annual for a meadow £2.49 Buy
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greater knapweed
Centaurea scabiosa greater knapweed Wonderful in naturalised planting schemes £2.49 Buy
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viper's bugloss
Echium vulgare viper's bugloss Magnificent flowerspikes £2.49 Buy
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corn marigold (syn. Chrysanthemum segetum )
Glebionis segetum corn marigold (syn. Chrysanthemum segetum... Bright yellow, daisy-like blooms £2.49 Buy
yellow flag
Iris pseudacorus yellow flag Glistening golden flowers for the pondside £7.99 Buy
Jacobs ladder
Polemonium caeruleum Jacobs ladder Bell-shaped, lavender-blue flowers in early summer. £6.99 Buy
tansy
Tanacetum vulgare tansy A wonderful companion to help repel insects £1.99 Buy
sweet violet
Viola odorata sweet violet Sweetly fragrant flowers £6.99 Buy
sweet violet
Viola odorata sweet violet Sweetly scented, edible flowers £2.49 Buy
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flag iris
Iris pseudacorus 'Berlin Tiger' flag iris Spreads quickly to form good-sized clumps £15.99 coming soon