Castanea sativa 'Bouche de Betizac'

https://www.denolf.com/plantguide/casbdbet-castanea-sativa-bouche-de-betizac-178794 https://www.denolf.com/web/image/plant.info/178794/image_1920?unique=5b184cf

Deep blue flowers with golden/yellow leaves. A combination which rarely occurs. Sunshine Blue flowers from August to September.