Seville Orange Tree

Asked August 5, 2014, 9:20 AM EDT

Tree is a house plant in the cold weather of Michigan and is then put outside when the weather warms up. Client has been doing this for the past 2 years. The tree has never bloomed. Client transplanted to new pot this spring using potting soil. Plant is fertilized once per month using 8-8-8. Client wants to know what may be causing leaves to look blotchy.

Alpena County Michigan orange tree

1 Response

Manganese or zinc deficiency is my first guess. Check the fertilizer to see if it has these micronutrients in it. How much 8-8-8 is used each time? Is it applied as a liquid or as a granule?

The striping is more typical of a nutrient deficiency, but I recommend that you look at the underside of the leaves with a hand lens for mites. These will be 1 mm or less in diameter and moving slowly around.