I want to know if I can make air pruning pots out of small styrofoam cups. My plan is to cut out the bottom part of the cup, attach a net/mesh on the bottom part to prevent soil from just passing through and also puncture small holes on the sides with a knife. Would such a cup/pot air prune the roots of my plants?
The way I understand air pruning pots, just poking holes will not be enough. The pots have a special shape to lead the roots to those holes, otherwise they would just run in circles and bypass the openings. I would strongly discourage you to use styrofoam cups anyway. Too much ick.
Air pruning requires, as Philipp mentioned, the roots to grow in a more natural (spreading instead of circling) way, this leads then to grow through the container for the growing soil and then the tips dry out and die.
While it is a novel method of keeping roots shortened and thus the plant smaller, you still need to come along and snip off the dead, exposed ends.
What it does is a type of Bonsai.
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posted 2 months ago
Philipp Mueller wrote:The way I understand air pruning pots, just poking holes will not be enough. The pots have a special shape to lead the roots to those holes, otherwise they would just run in circles and bypass the openings. I would strongly discourage you to use styrofoam cups anyway. Too much ick.
I think that's short for "toxic ick". On permies.com we tend to favor things that use natural stuff. So styrofoam, and the process that mines and produces it, is not held in the highest regard. Now if you were taking used styrofoam cups and getting another use out of them before they enter the waste stream, that would be awesome.
Welcome to Permies by the way. I haven't tried air pruning yet myself. I can't even get hardwood propagation working Here's a video by Edible Acres on how he builds air pruning beds. It doens't have guides for the roots either so maybe there is hope yet...
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