Planted May 31st (In the Minneapolis area). Has been watered regularly and seemed to be doing fine until about a week ago. I fertilized with an azalea/rhododendron fertilizer (1 tsp to 1 gallon of water) 4 or 5 days ago. It is planted on the east side of the house and receives sun about 8 hours a day. Is it possible I watered too much? (as you know it's been beastly hot here), or was the fertilizer a bad idea?
Why Are the Leaves on My Rhododendron Curving Up and Losing Their Luster?
Certified GKH Gardening Expert
I suspect that it may not be getting enough water. Newly planted shrubs are hard to overwater the first year (unless they are in standing water) and this has been a very hot summer so it would need even more than usual. I would try increasing the amount of water you are providing.
The fertilizer is fine as long as you mixed it and applied it to the packagings directions.