Bottlebrushes belong to the genus Callistemon, which is native to Australia. I took a few pictures after weeding, which I am including here. The new bottlebrush, as seen in this post, is not yet planted. When it is, I will add those pictures to this post.
Bottlebrushes are supposed to interest hummingbirds, but I have not seen the original two bloom, so I am not sure yet.
The green bottlebrush will have green flowers! If it blooms.
Monrovia, the grower of Callistemon citrinus ‘Little John,’ says that it only gets to three feet tall and five feet wide – much smaller than the other two.