Mine are treated timber, i called tony murrell and he said treated timber is fine, I've had no serious side affects.
trade4us2,
Jul 18, 5:45am
H3 treatment is not good enough next to soil. H4 or H5 is good but I imagine the chemicals are even worse! I used half width sheets of corrugated iron for my raised bed. That stops the weeds creeping in.
mack77,
Jul 18, 8:40pm
Research has shown that the amount of chemicals (copper, chrome and arsenic) taken up by plants from the leaching of CCA timber is dependant on the type of plant and the nutrient status of the soil. I believe that CCA timber is banned in USA.
zak410,
Jul 18, 8:47pm
A 10 year old tanalised fence post is about half the weight of a new one, if that.
trade4us2,
Jul 19, 12:57am
I planted a tomato plant next to an H5 post because there was nowhere else sunny to put it. I've had thousands of tomatoes off it since last spring. The plant is still healthy. There are a dozen tomatoes still on it but the weather is getting a bit bad at the moment. I got 5 ripe tomatoes last week.
maccachic1,
Jul 20, 5:49pm
Loads of copper being sprayed on Kiwifruit at the moment wonder must be test results out there.
pauldw,
Jul 20, 7:01pm
The timber industry there has stopped using CCA for RESIDENTIAL timber. It is still used on commercial timber. Given 30 or 40 years they'll probably find something wrong with the alternative chemicals.
bluefrog2,
Nov 18, 9:46am
Yes it does leach. But as previous poster mentioned, I've never heard of anyone poisoned by tantalised timber around vege beds either. My vege beds are untreated macro sleepers, but the glasshouse base (in direct contact with the soil) is tantalised timber. If you're worried, use Macro, recycled brick or the Warehouse is even selling Zinc sided raised beds these days.
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