This grower is fairly sure of this plant identification.
Started from seed earlier this year and will flower next year
Digitalis purpurea f. alba form (Foxglove). A slow-growing, short-lived perennial with spikes of large, pointed, lance-shaped, medium green leaves. In late spring, tubular, white flowers are borne on upright stems.
Watch out it is poisonous and allergenic.
Under shrubs, borders
Italics = data drawn from parent genus or speciesView Full Plant Finder Record