The shape of the flower can be important for the bees. Ornamental double flowers are just too much effort for bees that struggle to get past all the petals and so tend to be less popular. Tubular flowers like Foxgloves are very popular with long tongued bees, such as the garden bumble bees rather than honey bees.
Teasels are places where cavity-nesting native bees will nest. Cutting them down after they die removes potential nesting sites, or, the overwintering bees that woud emerge next year.
Bees love the sun, so the same plant in the sunny location will always attract more bees than a shady one. Wind can be a real problem. Bees like sheltered conditions, so a purple flower in the full sun behind a sheltering bush or wall is ure heaven for a foraging bee.
Spring Flowers Favored by Bees
Early Summer Flowers Favored by Bees