This started out to be about blue, and how plants that are far apart in most ways may be mighty similar in the color department.
But then the larkspurs took over, because – at least in the north – they’re a real low fuss delight (unlike some flowers we could name). Larkspurs are so closely related to delphiniums they used to be in the same species, but this airy member of the family almost never needs staking.* Also unlike delphiniums, larkspurs are seldom bothered by slugs and snails. Plus they don’t dwindle and die out on you after a couple of years. Plant just once and have them forever.