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from The Family Handyman

Build Your Own Self-Watering Planter

Save water and grow healthier veggies and flowers with a self-watering planter. This attractive cedar design uses perforated drain pipe to store and distribute the water.

from homedepot.com

3 in. x 10 ft. Perforated Drain Pipe

3 in. x 10 ft. Corrugated HDPE Perf Drainage Pipe - Made from robust, high-density plastic, this product is durable enough to resists corrosion and abrasion. Its deep-bell coupling is spun-welded. - THD SKU# 137642

from Dwell

This Home is Complete with an Indoor Jungle

Cut-outs in the concrete slab floor allow for an indoor forest of taro, fig, and bamboo; a sub-surface drain connected to a perforated underground pipe slowly filters out excess moisture to the groundwater. The cabinets were custom designed by Nick Damner, while the refrigerator and dishwasher are by Thermador

My first sub-irrigated raised bed, I bought a 100 ft perforated drain pipe with a cover already on it, then cut it to the size I needed. No need for weed cloth. :)