I love Echium Vulgare, (Vipers Bugloss) as much as the bees, the plants are messy and floppy but we pulled a lot of honey off the hives last year when I planted 1/2 an acre for 4 hives. Because the nectar is provided continuously through the day, and doesn't get washed away by rain, I wanted to try it, as a supplement to the clover .
I've never seen the white version though, did you buy the seeds online?