Does anyone have a recommendation for framing material (pref wood) for raised garden beds that is cost effective, aesthetically reasonable, and non-toxic? Pressure treated lumber is probably most durable but unless a barrier layer (plastic ?) is incorporated between frame and soil, there may be health issues introduced. Beds will be approx 4'x15'. thank you !
Don't know if it is available in Vancouver, but over here one can get 'planks' made of recycled plastic, with imitation wood grain on the surface. Mainly used for making picnic tables and similar, but it should be suitable for your needs. Agree that pressure-treated wood is likely to be toxic.
A little labour intensive to install but local stone (if it works with your design) makes a wonderful frame material. Les
After pricing many alternatives, we did use pressure treated lumber (ACQ not CCA, no arsenic), and then lined them with bamboo barrier. This stiff plastic was easy to install, and made a very solid barrier between the wood and soil. We considered the plastic composite wood, but most of that is not rigid enough to hold the soil without warping.
Not sure what your aesthetic is. Used concrete chunks can work, and be quite bohemian looking - suitability depends too on what you intend to grow - assume at least some food plants. Simple boulders might work too if you aren't married to wood. If you must have wood, why not cedar?
I'm going through same discovery process of what to make raised beds out of. I've looked into PT wood, cedar and composite wood (Trex?). Cedar is almost twice the price of PT wood. And the composite is almost twice the price of cedar (but it'll last a lot longer too). Thinking outside the box, so to speak, I've come across this: http://www.leevalley.com/garden/page.aspx?c=1&p=47455&cat=2 Attach the metal fasteners to cheap 2x4 and then buy concrete patio pavers of the right height. Much cheaper than the wood options and it'll last forever. Also, it's a lot easier to change the configuration of the bed if I decide to in the few years.
If cost is a problem, go to scrap lumber from pallets. Won't last forever, but then even cedar doesn't.
Great idea with the bamboo barrier. The Lee Valley idea looks interesting. Stock tanks make great raised beds. Farm supply stores can be a great resource. Also farm auctions. Farmers let leaky stock tanks go for cheap and for raised beds a little drainage is A-OK. They will last decades.
The home improvement stores around here apparently don't use arsenic based treated wood anymore. And it's not hard to line plastic or rubber pond liner between the wood and and soil anyway, which totally separates the wood from soil.
Dac, We use thick untreated cedar for our raised beds, and always have. It is natural, chemical free and the best to use for organic gardening we find. Best to avoid anything treated, painted, or other unnatural materials if you will be growing food crops. Cedar will last much longer outdoors than other types of wood, so it is well worth the investment in that regard. You can make a neat & tidy box out of cedar, which is esthetically pleasing. Best of luck with your garden boxes,
I really like this idea. Have you put one together yet? If so, I have some questions. How many stones did it require? Was it deep enough, i.e. how tall is it? What, if anything, would you say are the drawbacks? Thanks a ton for the info. I was really at a loss of how to build a raised bed. I can't wait to get started!!
Well, this is how it turned out. I'm pretty thrilled with it and it was pretty easy - lots of work - but easy. I have never had such success with a garden before. Part of it has to do with the concrete holding the warmth of the sun, part of it is the better soil mix I filled it with and part of it is the great home-made fertilizer recipe I came across. These pics were taken in mid-July after planting in early June. http://picasaweb.google.com/cgsith/Garden
Wow! Your garden looks fabulous and I'm sold on concept. It actually has to be easier than the slightly raised bed I built last spring. I'm going to order a couple of them right away. Thanks again!
I was going to say that here we would use Railway sleepers, Just one example with sleepers: http://www.kilgraney.com/James Whitely's railway sleeper project hopes.htm But your garden I have to agree with love4bug its lovely..well done.
MD, That looks really rock solid It could be the answer for my small garden which when it rains (like always) gets water logged. Its heavy clay which is almost undigable and would cost as much to improve as to buy something like your image. Mmm..possibilities. Thanks!