24+ Why Are My Hydrangea Leaves Turning Brown. If you recently transplanted your hydrangeas to a new spot whether from an existing area in your garden or from a nursery, hydrangea could simply be turning brown because it doesn't. I do not see signs of iron chlorosis (the leaves turn light green or yellow with the leaf veins remaining dark green).
I have an endless summer hydrengea newly planted this spring, it has beautiful pink flowers and they are now turning brown.
To lower your soil's ph and make more iron available to your plants, add chelated iron to your garden, following the directions on. Why are leaves dropping off? Thread in the hydrangeas forum forum by alexakaran: Why are the leaves on my hydrangea bushes turning brown?