Cut the bottom off a plastic pot to contain invasive plants & bury in the ground, works great for containing plants that tend to spread. Use a larger pot so that the plant can spread it's roots and grow deeper roots. Great for bamboo!
Some effective pest remedies can be found in the kitchen. Always test homemade remedies on a small portion of the plant to make sure they will not harm it, and never apply on a hot or bright sunny day, which could cause plants to burn.