Bright yellow flowers from red stems in large heads Jul-Aug, 60cm. In my opinion the same as the species – cultivar name inappropriate.

Genus: OENOTHERA
Variety: FRUTICOSA subsp.GLAUCA
Cultivar: ‘SUMMER SOLSTICE’
Plant family: Onagraceae
Hardiness zone: H7(below -20C)
Height: 51-100cm.

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Other data

Foilage colour
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Plant ID 4758