I don't know if this is the right thread to post in. Maybe Jarred can merge the three threads?
Here goes anyway.
Each fall, as the temps drop and the plants get cool weather and some rain, the leaves on my plants get these kind of spots on them. I figure that's my cue to start winterizing them. I try to exclude anymore water from soaking the ground, and start potting up my more sensitive varieties. I mostly have edibles, and some show more spots than others.
Being Basjoo and Sikki are both very cold tolerant, it seems that both should look the same. Did they harden off well before going outside? Maybe bringing them inside will help 'til it warms up a bit.
Then again, I could be all wrong...
Good luck!
That's a lovely Sikki, by the way...