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Here are some clever products that can save you time and help reduce water usage.
Rain sensors, combined sensors and temperature sensors shut off irrigation systems when rain falls. You can also buy solar-powered watering units. Water rings are plastic rings that help retain water around the root zone of plants to prevent run-off. Water bags are UV-treated and hold 25L of water, enough to water a sapling for up to 30 days. Self-watering pots have a reservoir in the bottom of the pot to hold water (right). The soil soaks up the water from below, so as long as the reservoir is kept full, your plants can access moisture.