Brown, tan, yellowish or black spots on hydrangea leaves may be anthracnose.
49+ Brown Spots On Hydrangea Stems. If your hydrangea has brown spots or rings on its leaves, there is a good chance that it is infected with hydrangea ringspot virus. Fungi and bacteria that cause brown spots on hydrangea leaves spread from fallen diseased leaves or pruned parts of diseased plants;
Hydrangeas Forum Is This Normal Black Spots On All My Hydrangea Stems Garden Org from garden.org
But anyway, i'll assume the plant is new and you have winter where you are, but it's a mild winter area i'm assuming, and the brown spots are nothing more then the plant if it's new going through shock or it is. Flowers drying may be because the plant was recently planted and is not used to the summer. The plastic in those fabrics creates a water and heat barrier for the soil below, keeping roots at abnormally high temperatures.
Brown spots in the stems are normal on some hydrangea stems.
Endless summer hydrangea grow in u.s. Similarly, if the plants are growing in full or afternoon this allows you to bring some of the stems up straight but have others bend over slightly. Blue hydrangea with stems and leaves. A reader's hydrangea seems to have caught a disease, darkening the stem and causing white spots.