I have tried it, not outside though. Here, at 1000 feet and windy in southern Scotland sweetcorn will not crop outside, so I grow it in a polytunnel, where it has good and bad years, even with a carefully chosen variety. The idea of the squash in the 3 sisters is to shade the roots - that bit worked fairly well but I would rather have had the squashes supported and growing vertically. When the beans grew well, the corn didn't crop, and when I tried dwarf beans, they were too shaded but the corn did ok. The previous time I ended up putting in canes for every bean, which rather defeats the purpose. So overall what I found was that when all three were grown together, only one did well. So I will be growing them all separately from now on. I will be interested to hear how you get on ATF, both with growing corn outside in Fife and with using the three sisters technique. I believe that the North American Indians also put a fish in the bottom of the planting hole, which could be the key ingredient, but I don't have any fish.....

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