Hello, I have 15 year old Sego palms planted in my outdoor garden, mostly shade. Last year, they became quite yellow. I was advised by my local nursery that I was over watering. I have evergreens that overhang the palms, so I thought the water was running off to the Segos, therefore cut back on watering. They have not crowned for 2 years. Last week I returned to the nursery with photos as it was yellow to brown with fronds splayed completely out and drooping. There are dark brown bands on the most recent fronds. I was advised to flood the palms as they were starved for water, flood every 3 days. I did purchase some magnism sulfate liquid, and fed, no change. I have read most of the articles available but do not see my condition listed. I would appreciate assistance, don't want to loose these wonderful plants.
