These species and hybrids aren't part of any series but have plenty to offer. These generally behave as true biennials, meaning they need the cold of winter before they will flower.
D. x mertonensis is an interspecific hybrid of two digitalis species. This is the one that is almost always described as "crushed strawberry" in color. I can't argue that! It usually becomes a short lived perennial, lasting 2-3 seasons.
D. lanata 'Café Crème' is a short lived perennial, generally flowering in it's second year. I suspect it will flower in the spring following fall planting. Said to be hardy to zone 5, we've always had it survive here on our zone 3 farm under decent snow cover. Brown and white flowers combine for an overall mocha feel. Very cool and textural, and one you rarely see in the cut flower market.
D. 'Snow Thimble' is unusual in that it is a pure white foxglove with no spots in the throat. Perfect for a summer white wedding. It is a true biennial, so it must go through the chill of winter before flowering.