abundant appearance Australia Australian bloom bottlebrush branches bright-red bush bush-plant callistemon callistemon-viminalis color colored colorful colors colour coloured colourful colours common contrast contrasting distinctive evergreen flora flower-spikes flowering flowers foliage full-bloom green leaves light native nectar plant red shade shape shrub spring stamens sunlight sunshine tree weeping-bottlebrush wildflowers bright red bush plant callistemon viminalis flower full bloom shadows soft weeping bottlebrush wildflower