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Originally Posted by Hayduke
I am sure since you are using this product though, there is no health concern.
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Still standing after all these years.

If there was a toxicity issue, my plants would have taken the hit first. Because of the application and plant's root tip response, copper ions are not translocated thru the plant.
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I am interested in the mechanical means as my friend who worked in horticulture for years asked me about cutting the roots...I just figured it was not good, and when I "upcan" my roots look like they have been chasing something around the pot...
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Cut 'em. I'll repeat what I've recommended for years - when you upcan pop the rootball out and using a razor or very sharp knife score the roots vertically. IOW, starting at the top of the rootball, plunge the razor about 1/2" deep and draw down to the bottom making sure you cut thru the roots at the bottom. Rotate the ball so that you do this about 4 times around the perimeter of the rootball.
And before you ask, no, you won't get root rot. Yes, you will get profuse root branching behind the cuts. This a very common practice in the commercial nursery trade.
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I thought well there is lots of roots and that is good. Using the net pots is also interesting. My buddy mentioned his local garden center selling cuttings in rapid rooters that they just let the outside roots dry out or cut them off...
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Those pots work fine unless the RH is real high. I have seen roots continue to grow thru and below the pot under humid greenhouse conditions.
De nada.
Tio Bendejo