Fukushu dropping all flowers

[poncirsguy]

My Fukushu on Flying dragon drops all flowers.  There is a huge dimple in it on the graft line.  Could this be affecting fruit set.




The date on the picture is from an unbiosed camera.  real picture date is 10-28-25

[brian]

The graft looks okay to me.  I'm not sure why all flowers would drop, something must be stressing it but I couldn't guess what without more info.

[vnomonee]

Pollination issue? Dropping after they've opened? Root issues? Could be a handful of things

[Millet]

A citrus tree drops all its flowers before fruit develops due to stress from environmental factors like inconsistent watering (both over- and under-watering), temperature extremes (like a late spring frost), or nutrient deficiencies, especially a lack of potassium. Other causes include poor pollination, insufficient sunlight, or a young tree needing to focus on root development. The tree is essentially shedding its blossoms to conserve energy and resources when it is under stress or unable to support the development of all the fruit.

Taken from google

[Millet]

You might also try hand pollinating the flowers with a little brush JUST as soon as the flowers open.

[brian]

Fukushu will definitely set a lot of fruit without any pollination, in fact when unpollinated the fruit is seedless!  I have had huge crops of entirely seedless fruit. 

[poncirsguy]

I have given the fukusu photoed above away and am down to 1 fukushu tree grafted to sour orange with a Poncirus trifoliata middle stock

Fukushu is to the left has 1 quat.  NZL is to the right has fruit ripening up.

I have 3 seed grown Meiwa trees and 1 grafted to flying dragon all produce fruit and my NZL just ripening up
I have had a total of 6 Fukushu kumquats.  I let 2 die outside winter and gave 3 away.  they all dropped all to maybe just 3 flowers.  My largest was 5 foot diameter by 9+ feet tall healthy well branched.

[BP]

Nice trees! What temps did the Fukushu die at?

[poncirsguy]

They started looking beaten up if not dead by 15F

[BP]

Dang! Do citrus show cold damage as its happening or is it very sudden? I havent taken any through cold before just trying to learn more about what the signs are or if you have to be proactive and less reactive to cold temps.

[poncirsguy]

I usually takes time before you find out its dead