I have a Kangaroo Paw var. "Amber Velvet" (an Anizoganthos hybrid), that I will have to grow as a container plant because it's not hardy in my climate (USDA Zone 8a) and must be brought indoors in the winter.
Some Internet research tells me that it will spread horizontally rapidly, so the container should be fairly wide. Also that it likes sandy, well drained soils. What I haven't been able to find out is how deep that soil should be when they're grown as a container plant.
Since it will have to be moved a couple of times a year (at least), and also because it'll be taking up space in my house for much of the time, I'd like to minimize the size of the container it's in, while still giving the plant enough room to thrive.
How deep a container should it have?