Hummingbird plants are not attractive to bees. Hummingbird flowers usually have no platform on which to land. Since insects use smell more and birds us vision more, hummingbird flowers usually have little or no scent. Also the flowers of hummingbird plants are usually spaced apart so that they can accommodate the whirring wings. The corolla of a hummingbird flower tends to be thick enough to resist the beaks of other birds that may want to pierce their way through to get nectar.
Hummingbird flowers tend to bloom for a longer period of time than other flowers.
They bloom in the daylight hours.