DIY drip irrigation system: bury a milk jug with holes drilled in it next to your plants. Stick the hose in the top of the jug and fill with water. Also works for feeding: add a scoop of fertilizer into the jug and add water.
Rolls of roses: Simply plunge the cuttings into the ground. Before planting cuttings, push the bottom end into a small potato, which keeps the cuttings moist as they develop roots. It sounds crazy, but the row of allotment roses is proof it works.