We have (4) Rhododendron's in our front yard, (2) of which are considerably "lighter" than the other's. I recall that it's important to periodically apply an acidic fertilizer, but don't know the actual type and frequency.
Could there be a relationship between the lighter coloring and this need to apply a fertilizer?
Would someone please tell me the type of fertilizer, the amount to be applied, and when to apply it?
Any other tips would be appreciated.
Thanks to all!
John & Joy