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Cold Hardy Citrus / Re: citrus grown from seed shows more cold hardiness
« on: January 11, 2019, 12:51:18 AM »
Whether it does or not must be prefaced by the seasons highs and lows. I had a 15 year old seedling grapefruit tree. never had any cold issues till 2014. this tree was huge with a 14' base and nearly twenty foot tall. lows of 18 started its demise with defoliation and tip damage. borers killed it the following year.
My point is that it wasn't the 18 degrees, it was the lack of cold temperatures leading up to the 18. Lack of suitable temps to harden off the tree was the biggest problem. I will say that the tree would not of died if the borers had not attacked. They probably would not have attacked if not for the tip damage. In 2014 I lost nine other trees to the freeze. No borers were involved in their death.
My point is that it wasn't the 18 degrees, it was the lack of cold temperatures leading up to the 18. Lack of suitable temps to harden off the tree was the biggest problem. I will say that the tree would not of died if the borers had not attacked. They probably would not have attacked if not for the tip damage. In 2014 I lost nine other trees to the freeze. No borers were involved in their death.