Brown spots appear on the leaves and grow rapidly in size. Two are planted on the south side of my home in zone 5 where they get morning and afternoon sun and evening shade. This produces large brown spots with lighter brown or tan centers in the spots. 4. are a poster-plant for the benefits perennials offer, bringing handsome foliage and beautiful blooms year after year. Do not place a hydrangea under a tree for shade, because the tree will most likely absorb the nutrients and harm the hydrangea. Ditto if your flowers wilt during the day and don’t bounce back at night. I recently had a colorful bouquet of flowers sitting on my desk as a little pick-me-up, and despite my best efforts, most of them started wilting after about a week. If it gets too hot and dry the flowers can wilt and turn brown in color. I have 'annabelle' She is beautiful and has huge flower heads, but they get so heavy that in a rain they fall over. If your hydrangea blooms are turning brown too soon and quickly petering out, they likely need more water. Acid to neutral soil is also ok. but dappled shade all day would be better as the blooms would be protected from heavy rain. Since hydrangea blossoms are so big, deadheading a hydrangea makes a real difference in diverting energy to more important parts of the plant’s growth. But if you see a bloom go directly from white to brown, that would not be normal and either a fungal infection is afoot or the plant needs more water. Sometimes entire hydrangea leaves will turn purple as well. Holey-Moly Foliage. To confirm, look for brown spots on leaf edges. Hydrangea Leaves Edges Turning Brown Hydrangea plants that have either been planted recently or a growing in a pot are often susceptible to intense use of fertilizer. Light-brown centers surrounded by dark-brown rings create a bull's-eye effect. 3. Dry, Brown Leaves on Hydrangea. When a spot encounters a leaf vein, it spreads along it, forming an angular brown or black patch. White blooms should turn greenish after a month or more; then the green tinted sepals can develop pink/red/purple splotches before turning brown. Brown Blooms. You should carry out this practice all through the blooming season to encourage new blossoms and keep your plant looking fresh. Leaves turn dark brown or black and drop. Make sure the hydrangea is in a place where there is morning sun and cool afternoon shade. Hydrangeas, chrysanthemums, and lilies were all in the mix, but the hydrangeas were the first to start drooping. The spots may also appear on the flowers, which … Two are still in pots, but are also turning brown and looking wilted. Flowers may also be affected. 1b. I added Mushroom and Peat moss to the original soil when planting. A hydrangea with brown leaf margins is likely suffering from a cultural problem, disease or pest infestation. 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