Drought-resistant plants including sea poppy and creeping zinnia can help trim irrigation costs, according to Steve Renquist, a horticulturist from the Oregon State University Extension Service. These plants are better able to thrive under "survival watering," which can mean watering a time or two per week instead of three or four. Meanwhile, compost-based mulches can help vegetables retain water, while woody mulches do the same for ornamentals.

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