Garden hoses tend to receive plenty of abuse. We kink them and twist them into positions they were never intended to assume. We leave them out in brutal summer sun and freezing winter conditions. Dogs chew them up, kids mangle them with lawnmowers, and adults repeatedly run over them with vehicles. Eventually the abuse can take its toll, resulting in a leaking split in your hose. Replacing a quality garden hose is expensive, so it just makes good sense to easily repair the one that you have.
Use a hobby knife to cut a piece from an extra garden hose to create a patch. The section should be 2 to 4 inches longer than the split. Make sure the hose diameters are equal.
Slice the patch open with a single end-to-end cut.
Soak the patch in hot water to soften it until it's pliable enough to force the cut open with your fingers.
Spread the patch open enough to clip it around the garden hose, covering the split.
Treat all the edges of the patch with silicon sealant and allow to dry.