You can temporarily plug a pinhole leak in a rubber hose by jamming a round wooden toothpick into the hole. Snap the toothpick off flush with the hose's outer skin. Then wrap the hose with insulating tape up to 2in/50mm on either side of the leak. Stretch the tape tight over the hole but looser towards the ends, so that it can flex as the hose bends. As the wood absorbs water, it will swell to seal the hole.
Never store a garden hose by hanging it over a nail or peg. The hose will sag and kink, and repeated kinking will crack the rubber, vinyl or plastic skin. Instead, mount an old wheel rim on the garage or garden shed wall and wrap the hose around it when not in use.
