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pistachios pollination

 
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Location: san bernardino, california
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on my mono crop mini farm i want to slowly convert it to permaculture. the pistachios trees are spaced 30' on center and all grown from seeds so they are random male and female. i know they are pollinated by wind but couldn't find any info if bees help in the process. i want to get rid of some of the males first but cant afford to get rid of any females yet. i found a good rule is 24 females to each male. is that correct? also how far away can the male be from the female to still pollinate?
 
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I've also sprouted my own pistachios from seed, and am expecting to see the same thing once they reach bearing age. Personnally, I would not recommend a ratio as low was 1:24. You've got a lot of time invested in those males, and if you reduce the ratio too low, it will take years to replace them.

I think a better option is to try grafting male branches onto female trees, and also female branches onto the male ones. You'll have a better distribution of male pollunators throughout your orchard, with lower loss of yield. If it works, you might gradually return to the idea of thinning out males, but only after you've observed several years of success. I'd plan on pollunation occurring 100% from wind. I'll be leaving males in all four quadrants to cover pollunation no matter which way the wind blows.
 
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