Re: propping the tall ones, best materials?
the 2 inch pvc will probably take the weight. use schedule 40. but if its to tall to reach with a ladder put another 45 in one end and on the other end keep going around with 45s and 90s to create a C with just enough opening to allow the plant to go into the center of the C. also I would post hole the legs in. post hole and use a shovel to create a ramp to slide the legs into the hole so you do not have to pick it up and drop them in.
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npk of wood ash 0/1/3 to 0/3/7
npk of banana leaf ash 1.75/0.75/0.5
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