I am experimenting with inserting an Excel spreadsheet directly into my blog (see below, bottom of post). It works so-so. I can’t alter the width of the columns after I paste the image, so the winter chill hours (number of hours below 45 degrees) that each fruit variety requires are kind of quirky looking.
In this spreadsheet, I separated the deciduous fruit trees (top of spreadsheet), which require winter chilling to set fruit, from the citrus and avocado trees (bottom of spreadsheet), which require no chilling, and subtotaled them separately.
We had good winter chill in 2011-2013, moderate chill in 2014, and a pathetic 76 hours of chilling during the 2014-2015 winter. The harvest of fruit from the deciduous trees appears to correlate better with the amount of winter chill than the citrus harvest–no surprise. I am not expecting very much deciduous fruit in 2015 due to the low chill this winter. My August Pride peach has a pathetic 10 blossoms on it, and my Katy Apricot is blooming early with very few blossoms. The Asian pears, apples, nectarines, and Babcock peach are still dormant.
Most of my fruit trees were planted 2007-2014. Some (persimmon, pomegranate, Gala apple) are too young to bear fruit yet, and some have not yet reached their good bearing years. And some years the birds and night critters get to the fruit before I do. So this is an experiment in progress.
I hope you can see the chill hours in the Required Chill Hour column.
My conclusion, based on very limited data and a lot of speculation, is that I can expect the warmer winters brought to us courtesy of global warming to have a negative effect on my harvest of deciduous fruit.
|# of trees||TREE Variety||req chill hrs||2015||2014||2013||2012||2011||2010|
|(actual chill hrs)||76||166||497||389||340||95|
|1||Apple, Granny Smith||400||14||60|
|1||Asian Pear, 20th Century||300-400|
|1||Asian Pear, Shenseiki||250-300||121||78|
|1||Asian Pear, 4 varieties grafted||250-400|
|2||Grape, Red Flame seedless||100+|
|1||Nectarine, Snow Queen||250-300||37|
|1||Peach, August Pride||100-200||8||16|
|1||Peach, Babcock Improved||250-300||5||44|
|1||Peach Florida Prince||150||150||252||108|
|1||Peach, Garden Gold||450-500|
|1||Plum, Santa Rosa||300-500||80||9|
|SUBTOTAL Zero chill fruits||0||1041||897||1108.5|
|Total oz||TOTAL FRUIT in oz||0||1312||1454||1409.5|
|TOTAL LBS||TOTAL FRUIT in lbs||0||82||91||88|