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 its roots and grow deeper roots, but keeps other tree roots from choking out the one I planted.
Do this in the fall: Plant bulbs in Pots. Store the potted bulbs in an unheated garage or storage room. You'll need to water every few weeks since the pots won't have access to rainfall. In addition to small pots, pack bulbs "shoulder-to-shoulder" in big containers for an abundant display in spring. Toss aside the spacing recommendations so you can get as many bulbs into the container that will fit.