What's this flower

[Gardenmac]

Any ideas ideas for plants are welcome, thank you

 

List from RHS has proved useful

ANNUALS

Borage (Borago officinalis); buckwheat (Fagopyrum esculentum); Californian poppy (Eschscholzia californica); candytuft (Iberis spp.); China aster (Callistephus chinensis); larkia (Clarkia spp.); cornflower (Centaurea cyanus); cosmos (Cosmos bipinnatus); forget-me-not (Myosotis spp.); Gilia capitata; godetia (Clarkia spp.); heliotrope (Heliotropium arborescens); love-in-a-mist (Nigella damascena); mignonette (Reseda odorata); Nemophila menziesii; Phacelia spp.; poached egg plant (Limnanthes douglasii); sunflower (Helianthus annuus); sweet sultan (Amberboa moschata); zinnia (Zinnia elegans).

BIENNIALS

French honeysuckle (Hedysarum coronarium); hollyhock - single flowered (Alcea rosea); honesty (Lunaria annua); wallflower (Erysimum spp.).

HERBACEOUS PERENNIALS

Agastache foeniculum; Alyssum spp.; Anchusa azurea; Arabis spp.; Aubrieta spp.; bellflowers (Campanula spp.); catmints (Nepeta spp.); cranesbill (Geranium spp.); dahlia single-flowered cultivars; fleabane (Erigeron spp.); Geum spp.; globe artichoke (Cynara cardunculus); globe thistle (Echinops ritro); golden rod (Solidago spp.); Gypsophila paniculata; Helenium spp.; hellebores (Helleborus spp.); ice plant (Sedum spectabile); Jacob's ladder (Polemonium caeruleum); Japanese anemone (Anemone × hybrida); lambs’ ears (Stachys byzantina); leopard's bane (Doronicum spp.); Liatris spicata; lungwort (Pulmonaria spp.); Michaelmas daisies (Aster spp.); oriental poppy (Papaver orientale); Monarda punctata; Persicaria amplexicaulis; Rudbeckia spp.; Salvia × superba; scabious (Scabiosa spp.); sea hollies (Eryngium spp.); Sidalcea malviflora; thrift (Armeria maritima); Veronica longifolia; white horehound (Marrubium vulgare); Verbena bonariensis.