Sub-irrigated planter

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Sub-Irrigated Planter
Diagram of a Two-liter bottle recycled into a sub-irrigated planter

Sub-irrigated planter (SIP) is a generic name for a special type of planting box used in container gardening and commercial landscaping. A SIP is any method of watering plants where the water is introduced from the bottom, allowing the water to soak upwards to the plant through capillary action.[1] It is possible to automate the watering and thus SIPs are popular with professional landscapers in buildings or urban settings. SIPs are available as products, under brand names such as Planter Technology (commercial) and EarthBox (consumer), Ollie Plant Sipper (consumer), Octopot (consumer), The Refuge Garden (consumer/commercial) or as do-it-yourself projects made from plastic buckets and boxes.[2]

One of the disadvantages of closed systems like Earth Boxes and SIPs is that soluble salts cannot be flushed into the lower soil profile and build up over time.[3]

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How to make a DIY Two Bucket Sub-Irrigated Planter