Sango Kaku Leaf Yellowing

scottfro

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Hello,

I have a newly acquired Sango Kaku that is showing a decline in leaf health since bringing it from the nursery a few months ago. I haven't repotted but have done a bit of branch pruing. I'm in British Columbia and we were in a MAJOR heatwave a few weeks ago. I kept it out of direct sun but figured it might be related to what I'm seeing. Please see attached photo....Is this a nutrient issue or something else? Thank you.
 

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Mikecheck123

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I don't see anything weird. Post more pics.

Is it getting a second flush of growth? That always looks much different than the one in spring.
 

scottfro

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The leaves seem to be exhibited chlorosis.
 

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River's Edge

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Hello,

I have a newly acquired Sango Kaku that is showing a decline in leaf health since bringing it from the nursery a few months ago. I haven't repotted but have done a bit of branch pruing. I'm in British Columbia and we were in a MAJOR heatwave a few weeks ago. I kept it out of direct sun but figured it might be related to what I'm seeing. Please see attached photo....Is this a nutrient issue or something else? Thank you.
All of mine are reacting the same way with the extra heat and extended daylight this time of year. it is dependant on the location. With the highest amount of yellow present on the most exposed to direct sun. The trees in more shaded areas have not faded as much. I am on Vancouver Island so expect the situation you are experiencing is the same as mine. The leaves otherwise look strong and healthy. A maple species that does better in shade and cooler weather. Even my tridents are showing difficulty with the heat and direct sun this year. that is a first.
just be sure to maintain moisture but not overwater.
 

Forsoothe!

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It is a light colored leaf to begin with and as above said, not a full sun tree, more like less than half day and no mid-day.
 

scottfro

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Great, thank you both for the replies. Frank, I'm just in Courtenay so experiencing the same conditions as you. I need to get down to your nursery sometime soon!
 

River's Edge

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Great, thank you both for the replies. Frank, I'm just in Courtenay so experiencing the same conditions as you. I need to get down to your nursery sometime soon!
You are welcome to arrange a visit. I operate by appointment only, so shoot me a PM or contact me through the website email.

I think you would benefit by being able to see the same species in two different locations and note the coloration change brought on by sun exposure changes. I have coral bark maple planted in grow beds, full sun and also in containers in the part of the nursery covered with shade cloth. The leaf colour difference is very evident. This is easy to see when an air layer of the tree is judged against the mother tree kept in different sun exposure. The substrate is the same, inorganic wether in the grow beds or in containers.

Your substrate could vary and thus require different watering routines. I would caution you against believing a lot of the advice with respect to watering from those who do not live in your area, or use the substrate that you use.

In the previous post I should have mentioned that in excessive heat trees can move into dormancy and that also affects colour change in the leaves. Essentially an early fall effect if you will, but created by hotter and drier conditions than normal, rather than cooler and wetter conditions.

One other factor is the condition of the root ball, recently repotted trees will be affected more if roots are still recovering and compromised when the heat and dry conditions hit. Another good example of this would be a recently separated air layer with limited root ball development.
Best in Bonsai
 

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