I recently found out that in addition to being highly invasive ( which it has not been so far in my garden) it is also highly toxic. The whole plant especially beautiful flowers are extremely toxic. It is a problem in Australia where grazing cattle die from eating the the plants. I have not found any articles to suggest that it is toxic to other animal but it worries me. My dog Frasier has been known to `taste' plants especially after a rain, licking raindrops off plants. I will have to consider removing this plant from my garden. So, this might be the last year you see these beautiful flowers. Frasier triumphs over flowers!!
Notice the plantlets at the end of the tubular leaves. Each one falls and becomes a new plant. One mother plant will make hundreds of new plants. ( the Jade Plant in the background is full of white flowers).