The species is rhizomatous and in some soils this habit of growth
may help the plant to spread more readily than you might wish.
I would suggest that, if you want a Phygelius in your garden, you look out for cultivars of Phygelius aequalis such as 'Yellow Trumpet' that are not so aggressive in their habit of growth
Picture Diabolo, yet with finer foliage and a more refined habit of growth
LANDSCAPE NOTES: Boxwood is somewhat formal in nature due to its global habit of growth
. It is still a popular foundation plant and is especially appropriate with colonial architecture.
It takes several years to build the right shape, but once a habit of growth
is established, it only needs regular pruning once a year.
The big question with most mints is how to control them - their normal habit of growth
is to spread sideways by vigorous rhizomes, which then produce the tall, annual stems from which we harvest the foliage.
As there are numerous named cultivars, each one special and it is impossible to generalize as to their flower form, colors, and even habit of growth
. If you think of doubled ruffled flowers 8 inches or more in diameter available in every color but blue, purple, or black, growing on plants that love the shade, you can imagine the worth of these cold tender bulbs in your garden.