Q.Why is this “Skookum Rhododendron” suffering, when the one next to it is fine.
They are planted 3 feet apart.
Should I “replant” it using different soil?
Certified GKH Gardening Expert
The other one must have a perfect spot. Proximity doesn't seem to matter when it comes to environmental problems or disease. I would start with a soil test to see if the pH is between 4.5 and 5.5. Is it possible the soil's acidity is different between the two? Also, is drainage different? They require well-drained soil. I see spots on the leaves of both shrubs. Is that dirt or a disease or bugs possibly. I would check all those aspects. The soil test will also tell if something is wrong nutrition wise.
Here are more growing tips:
https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/rhododendron-care.htm
https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/how-to-fertilize-rhododendrons.htm
