The benefits of a self watering raised bed have become clear after a summer of constant daily watering due to drought. Building one now ranks high on my project list. I’d seen manufactured self watering pots with their water reservoirs on a much smaller scale. But it was my research for Raised Bed Revolution that introduced me to a gardener who had an entire rooftop garden filled with what she referred to as SIPs—sub-irrigated planters.
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