Bees love all Comfreys. White Comfrey (Symphytum orientale) is one of several varieties in the garden. Here in London it has been in leaf all winter and is already flowering, whereas out of town I notice clumps of it are just starting to become bushy and form the flower buds.
 By growing three or four different Comfreys it's possible to have one or another in flower from early spring to mid-summer. The leaves are rather similar but the flowers range from pure white to sky blue, from creamy white to lemon yellow, not to mention shades of pink, red, purple and magenta. Some are creepers, some are clumpers, all are vigorous and apt to spread (which I approve of). It's said that cultivars like Bocking are sterile so not invasive but Comfreys interbreed very happily and off they go.
 We have the bees to thank for that and the bees will favour any garden with Comfrey in it.