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. (Herbs)
Try this old gardener technique for making new flower bed: Arrange a garden hose in an attractive shape, where you want your bed. Weed whack all the grass, but pull the very aggressive weeds out. Layer 6-8 sheets of wet newspaper (no glossy ads) inside the hose area. Overlap edges. Cover with 4-6 inches chopped leaves. Leaf mulch from a garden center works well. Fall is the best time to do this. Next spring the paper has decomposed and you are left w/ loose, airy soil, making planting easier.
How to Water Your Plants When You're Away - Snapguide