Sweet Viburnum disease or deficiency
(Cobbitty, NSW, Australia)
Viburnum tree 1
Thanks for looking into this issue.
I live in Australia in NSW in Cobbitty.
We are into Winter now and over the last couple of weeks in Autumn,My Sweet Viburnums have been showing red leaves over 30+ trees. Per tree i estimate 20 leaves show this colour. Ive had these trees for over 5yrs since planting. 1mtr in height. The temps range from 1 to 5degrees in the night to 15degrees in the day.
My soil is loamy clay and its in full sun for 7hrs a day. Winter its about 5 or 6 hours. I use blood and bone and slow release fertilisers. I actually put potash down during Autumn to strengthen the cells to cope thru winter. Maybe that could be the cause.
I hope you can help with this issue.