Often called "Lavender Cotton" it really is not a lavender at all. It's gray santolina, also available in green, and is great for training and trimming in pot as Xmas tree, or for lining walkway. The grey is perfect for outlining path of walk at night as foliage reflects moonlight and aids in navigating.
Use Colorful Foliage: Contrasting foliage colors and textures can create even more impact than using flowers in the garden. This stunning planting, for example, employs blue-gray oxalis, purple polka-dot plant, and golden Angelina sedum.
Cut the bottom off a plastic pot to contain invasive plants & bury in the ground. I have been doing this for a few years & works great for containing plants that tend to spread, but that I still want to plant in the garden. This also works good for planting a plant in an area that tends to get filled with roots etc. from other plants. I will use a larger pot so that the plant can spread it's roots and grow deeper roots, but keeps other tree roots from choking out the one I planted.