Asked September 26, 2020, 11:19 AM EDT
Ramsey County Minnesota
The following document addresses your question.
Our guess is that the plant needs a bit more water than it has been getting. However, as you know, too much water can produce similar symptoms.
You seem to have taken precautions needed to prevent too much sun exposure.
Excessive fertilizer or salt build up in the potting soil sometimes causes leaf burn.
On Sep 26, 2020, at 5:50 PM, Ask Extension wrote: