Peggy8b said:I assume you give them both acid-loving fertilizer on the same strength/schedule? But if that's not helping, the pH may be too alkaline for it to absorb those nutrients. This article suggests sulphur to change the pH to make the soil itself less alkaline: https://www.thespruce.com/gard...
I wonder if the paler specimen could be getting more water than the greener bush or draining off less effectively for some reason? Have you had an excessive amount of rain this spring/summer like Texas has? Any chance could it have suffered any root damage from digging/shoveling in the area?