Is there a suitable set of flowers for each month/season,
early spring to late autumn, which could be planted/grown
in order to keep bees buzzing for as long as possible ?

or

Which flowers should I have already flowering during early
spring so that the bees can get their own act up&running as
early as possible ?
And then which flowers do bees like that are late flowering
so that bees have something to work on in late autumn ?