Causes of damaged or dropped flower blossoms include environmental stresses and pesticides.
- Environmental stresses that may damage flowers are drought, frost, or freeze damage of flower buds or blossoms. Late winter sun can prematurely stimulate the opening of flowers, killing them in freezing night temperatures. Late frosts or freezing temperatures in the spring damage opened flowers. Cold damaged flowers initially appear water-soaked and eventually turn brown and die.
- Improper pesticide use can damage or kill flowers. Application of pesticides at improper temperatures (too high or too low) can damage flowers. Always follow label directions for timing and rates.