Crimson Bottlebrush originated near Botany Bay in southeastern Australia, where seasonal change affects the ecosystem like Kotor. The ancient walled city of Kotor sits at the innermost point of the bay, shaded by two steep and rugged mountains that create a biosphere for extreme weather. The city recommends planting the naturalized shrub because it thrives in the hot summers and fends off frost in the winter while producing its own natural herbicide.