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Topics - David Kipps

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Cold Hardy Citrus / Seed development after picking
« on: November 15, 2023, 06:33:36 PM »
Will seeds within a slightly immature fruit continue to improve viability after the fruit is picked?  I usually hear that citrus fruit do not continue to ripen after picking (But I have heard a few disagreements to this.).  What about seeds?  Due to freezes, my borderline hardy citrus need to be picked before totally ripe (or even fall off).  I am primarily interested in the seeds for producing a next generation.  Will letting these green/halfgreen fruit sit on the counter for a week or two help the seeds to become more viable, or should I just cut them and extract the seeds right away and plant right away?

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Cold Hardy Citrus / Winter damage, Yuma citrange F2
« on: April 17, 2023, 02:24:37 PM »
The previous winter, these trees all survived with gradual leaf loss toward totality by spring.  This past winter went different.  The Christmas cold and wind burnt the edges of the leaves, but did not kill them, leaving many of them to still be alive and green till now.  Even after a couple of weeks passed, it looked like there would be near 100% tree survival, but sometime in March I realized that quite a number were dying.  So I've ended up with some being nearly evergreen and others dead and others in-between.  In the picture, the whiteish dead twigs at the top were late tender growth that was killed as expected at the beginning of winter (which happens anyway, any year, even on P. trifoliata).  The more golden dead twigs (one with orange ribbon) are from the disappointing late winter kill off of trees that had survived the last several winters.

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Being a desert plant, does Erimocitrus require more alkaline soil?  I've had terrible success with it.

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Cold Hardy Citrus / Storing pollen
« on: February 25, 2023, 07:35:21 PM »
Due to different bloom times, I am trying to store citrus pollen, sometimes up to a year before use. Can it be kept viable that long? Dried? Refrigerated? Frozen?  Can drying be done with only room temperature house air? Can you use a lamp to speed it up?  Should non-dehisced anthers be allowed to dehisce before drying, or do you dry them right away?  Do you need to crush them to release all the pollen?  When you use dried/stored pollen, do you just put it on the stigma as is, or do you need to mist or rehydrate in any way?

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