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.
Allium's will add height and calm drama with it's pom pom style flower heads.A versatile plant for cottage beds to the modern steel container. Plant them near to the front boarder so there slender necks are shown off. Sublime