You should carry out this practice all through the blooming season to encourage new blossoms and keep your plant looking fresh. If your hydrangea blooms are turning brown too soon and quickly petering out, they likely need more water. 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. Dry, Brown Leaves on Hydrangea. Flowers may also be affected. Acid to neutral soil is also ok. but dappled shade all day would be better as the blooms would be protected from heavy rain. 4. If you have a border that gets early morning sun a white hydrangea will be ever so prolific in flowers. The spots may also appear on the flowers, which … When a spot encounters a leaf vein, it spreads along it, forming an angular brown or black patch. Light-brown centers surrounded by dark-brown rings create a bull's-eye effect. Brown Blooms. Anthracnose is caused by the fungus Colletotrichum gloeosporioides. 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. I added Mushroom and Peat moss to the original soil when planting. Two are planted on the south side of my home in zone 5 where they get morning and afternoon sun and evening shade. Holey-Moly Foliage. Brown spots appear on the leaves and grow rapidly in size. Hydrangeas, chrysanthemums, and lilies were all in the mix, but the hydrangeas were the first to start drooping. Ditto if your flowers wilt during the day and don’t bounce back at night. If it gets too hot and dry the flowers can wilt and turn brown in color. 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. A hydrangea with brown leaf margins is likely suffering from a cultural problem, disease or pest infestation. Make sure the hydrangea is in a place where there is morning sun and cool afternoon shade. 3. Two are still in pots, but are also turning brown and looking wilted. With their broad leaves and clusters of long-lasting fall and summer-blooming flowers, hydrangea (Hydrangea spp.) This produces large brown spots with lighter brown or tan centers in the spots. 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. To confirm, look for brown spots on leaf edges. Do not place a hydrangea under a tree for shade, because the tree will most likely absorb the nutrients and harm the hydrangea. My Quickfire hydrangea white flowers are turning brown. To fix, deeply water hydrangeas once a week. Sometimes entire hydrangea leaves will turn purple as well. 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