Posted: 28/04/2016 at 22:34
3 years ago I sowed my whole front garden with Phacelia tanacetifolia, (sold as a green manure) and more bumble bees than I ever thought possible.
I counted at least 7 species plus honeybees and at one point was counting over 100 bees per square yard.
No need to buy bees.
Sow phacelia and they will come.
( it does rather self seed though)