Just for interest, not for controversy
Last year I grew potatoes in tubs as I always do, even when I have load in the ground. I used 8 identical tubs and the same potatoes and amounts in all of them.
I filled 4 of the tubs and planted the potatoes as I would in the ground and that was all they got,the spuds went in about 5 inches deep.
The other 4 I put about 6 inches of soil in the tub placed potatoes on surface and covered them with soil, as the green showed I covered it, several times. till the bins were as full as the other 4. At harvest time I had a great many more potatoes in the 4 layered bins
In a raised bed I hilled one side and not the other, I had a greater harvest from the hilled side.
Coincidence maybe, two coincidences well still maybe, however the difference was substantial for what it is worth and for whatever reason, coincidence or not.
I am layering this year in the same tubs,,which by the way are Rubbermaid containers not towers
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