The need for garden hose guides is self-evident: Without them, you will destroy the plants you are attempting to water. These small plant protectors keep your hose from running through your garden beds, which also helps keep the hose (and therefore your hands) clean of dirt and debris. For many people, the problem with garden guides is that they are flimsy, embellished eye sores, that are as unappealing as they are useful. Fortunately, making your own simple and durable garden hose guides is an extremely easy project.
Use lawn spray paint to mark the locations for your hose guides. Garden bed corners are common locations, but you may get as elaborate as you like with the path your hose will follow. It should be practical first and foremost, functioning to simply direct the hose safely to the areas of the yard where you want the most water.
Take your steel mallet and hammer the rebar into place. Your own aesthetics will determine how high your hose guides stick out of the ground. Be sure to drive the rebar at least 12" into the ground for stability.
Slide the copper tubing over the rebar, making sure not to secure it in place. Ideally, you want the tubing to freely wheel about when the hose makes contact with the guide --- this way the hose is not subjected to inordinate amounts of friction.
Take the copper cap and screw it onto the tubing for a finished look.