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Topics - kumin

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I suspect there is some correlation between leaf size and stem thickness in seedlings to the fruit size they will produce when they attain maturity. Has anyone found such a link, and if so, how closely were these characteristics linked? Pummelo and citron as well as grapefruit appear to follow this trend.

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Cold Hardy Citrus / Citrus seed germination beginning in 6 days
« on: March 01, 2019, 02:15:12 PM »
Here is the first indication of 27 TaiTri seeds beginning to germinate on day 6 inside a repurposed poultry egg incubator. The auxiliary thermostat is set at 86 deg. F., the seeds were disinfected and the seed coats were removed prior to planting. Disinfection and seed coat removal decrease the likelihood of there being albino seedlings.
This setup should use very little energy.

First seed close to emergence


Replacement thermostat used, original thermostat removed. Setpoint 86 deg. F.


Retired incubator repurposed as seed germination mini-chamber.


Roots have also begun development.


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Cold Hardy Citrus / F2 citrange winter hardiness trial
« on: January 25, 2019, 08:04:22 AM »
I'm trialing a population of F2 Citrange seedlings this winter in zone 6b in SE PA. There is considerable variability in the resistance to low temperatures, with some dying in November and others still viable at this point. The population is a mixture of nucellar  F1 and zygotic F2 seedlings. The F1 are freezing out at present, but a number of the F2 are surpassing the F1 in hardiness and a few appear to be surviving the winter. My hope is that several will approach the hardiness of P. trifoliata.

Any survivors would then be evaluated for palatability. My focus is centered on hardiness, with palatability being secondary.

I've grown poncirus since 1980 and lost everything above the snowdrifts in Jan of 1994. This was after 2 consecutive nights at -24 F. The trees resprouted below the snow height and haven't been injured since.

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