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Originally Posted by remorse
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You should be able to get SOP (potassium sulfate) or MOP (potassium chloride) at your garden stories and/or ag centers. ... Also you should be able to get potassium nitrate (aka: stump remover)(NPK: 13-0-44) at local hardware stores. Just make sure the stump remove does not have any additives in addition to the potassium nitrate.
I haven't used the spikes. You have to figure out how much K is in each spike and how many are needed for the 8 ft to 10 ft radius around your nana plants; and how fast the spike will dissolve to supply the K. Assuming of course there is adequate rain fall or irrigation during the season.