There is a whole family of shrubs/trees called Callistemon, or Bottlebrush. These trees/shrubs with dense foliage are a valuable source of nectar, when flowering. Several types of honeyeaters feed on their nectar. Some small parrots/lorikeets will take either nectar or the budding flowers too. Having dense foliage, bottlebrushes are also popular with some bird species for nesting. Bottlebrushes are often found in heath or along often sandy creekbeds.