Raised bed planter kit converted to sub-irrigation - Click photo to enlarge
The Garden of Wonder at PS 133 in Brooklyn now has five sub-irrigated planters (SIPs) of the raised bed type, including a partially planted demonstration planter. All planters are prefabricated kits from Home Depot.
The sub-irrigated raised beds are in addition to 70 tote box SIPs and 30 feet of dual-track sub-irrigated rain gutter system housing a garden of large round planters.
The benefits of all sub-irrigated planters (SIPs) over traditional top-watered beds for vegetable growing is increased productivity (up to 50%), reduced water usage (up to 90% less) and ease of use for all gardeners, novice or experienced.
They are also the safest, most hygienic, way to avoid toxic metals contaminated urban soils. The plant root system in SIPs is never exposed to the underlying soil. The same cannot be said for conventional raised beds.
Research shows that city soil contamination is widespread and under-reported by the gardening media. Lead contamination is of particular concern where there are young children involved.
Although the planter kits are relatively lightweight cedar, they will likely outlast heavier planters because they are not exposed to water. Sheet plastic liners make them watertight.
You can assemble the kits with a screwdriver, but it is much faster to use a power drill (screw driver attachment). You will also need a drill to bore a hole for the overflow drain hole. A heavy-duty stapler is the best way to fasten the liner. A rubber mallet is also helpful when assembling the planks and corner posts.
After installing the liner, the next step is to create the water/oxygen reservoir system. We used recycled nursery flats installed upside down for these beds. They are quick and easy to install and you will be helping the environment by keeping them out of landfills. Find them at your local garden centers and/or landscape contractors.
Other recycled food containers such as milk and juice bottles, produce containers (ex. mushrooms) also work well. Perforated, corrugated drain pipe (aka ag pipe) works but you may have to special order it at your local home improvement store.
Final steps are the addition of a fill pipe in one corner and one or two overflow drain holes (1/2" clear plastic tubing extending from one of the reservoirs through the wood to the exterior).
Adjacent sub-irrigated "bean bed" with 2-week old bean plants grown from seeds planted by students from PS 133
Stay tuned. There are many more photos to come showing other wonders of the PS 133 Garden of Wonder.

Where in the World is Greenscaper?
Those who know that I am pushing 80, have gone through prostate cancer treatment, two knee replacement surgeries and significant hearing loss in the past couple of years might think that I had gone to meet my maker.
Not so! In fact, I am still on the planet here in Brooklyn and am now walking on two new knees. Through the miracle of modern medicine, I have two straight legs, can walk normally and for the first time in over 25 years will be walking free of pain in a few months.
Hallelujah!
If these legs are made for walking (hark Nancy Sinatra), they are going to walk me back to California early next year. Well, not literally. I may take a train instead of flying and stop in Chicago and Milwaukee on the way. There are projects and people I would love to meet in these cities. I might also stop in Denver where I first fell in love with the West back in my IBM days.
Those here in New York may be interested in an event scheduled before I go. On Wednesday, November 7, there will be a three-hour sub-irrigated planter (SIP) workshop (from 6-9 pm) at Brooklyn Botanic Garden. It is sponsored by the ever-popular GreenBridge program of BBG. We can thank Robin Simmen, Director and Nina Browne, Manager for their progressive vision in sponsoring this event.
The workshop is not just about houseplants. It will be about growing all rooted plants in SIPs. If they have roots, it does not matter whether they are decorative or edible. All terrestrial plants love sub-irrigation whether indoors or outdoors. Everyone will take home a soda bottle SIP and know how to use it.
Even better, I have decided to give away the plants in my lab to workshop attendees. This includes plants growing in conventional potting media as well as clay pebbles (hydroculture). Most people are unaware that both sub-irrigation and hydroculture are simple forms of hydroponics.
Research tells me that hydroponics (including aquaponics) will play a dominant role in the near future of urban agriculture. With that said, all workshop attendees will leave with a basic understanding of hydroponics through the use of SIPs.
Growing some plants in SIPs will help immeasurably to demystify this subject. Even better will be to demystify and debunk some of the urban myths that plague the hobby of growing plants in containers.
Stay tuned for more details about the workshop along with information about the future editorial content of Inside Urban Green.
Posted by Greenscaper on October 15, 2012 at 10:27 AM in Editorial Comment | Permalink | Comments (8) | TrackBack (0)