A Not Very Good Idea
 

My pond filter is a plastic container, about 20 inches diameter, 15
inches deep.

I had it filled with lava rock, which worker rather well. then I
planted cannas in it. they grew quite well. Then the roots plugged
up the gravel and no water would go through. I ground off my
fingetrnai;s and a bit of skin on my hand digging out the lava from
underneath the plants. I'm not sure which is worse, cannas or iris.


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- Charles
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-does not play well with others