Baby Hand and Footprint Stepping Stones: Make a footprint every year and soon you'll have a path of prints running through the garden as well as a growth chart. - Wish I would of seen this idea 2 years ago.
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!
DIY - Weed killer - When nasty weeds pop up, don't reach for the weed killer. Douse them with vinegar, lemon juice or boiling water instead. The weeds will likely shrivel in a day or so. Resilient ones rarely withstand a second treatment.