What Causes Black Spots on Hydrangea Leaves
If you want to understand the reasons behind black spots on hydrangea leaves, please read the detailed introduction below.
What Causes Black Spots on Hydrangea Leaves
1. Excessive Sunlight: Hydrangeas exposed to excessive sunlight may develop black sunburn spots on their leaves. 2. Overwatering: Too much watering can damage the hydrangea roots, leading to poor internal circulation and resulting in black spots on the leaves. 3. Fertilizer Burn: Over-concentrated or frequent fertilization. 4. Disease Infection: Severe infection of leaf spot disease on hydrangeas, causing black spots on the leaves.
1. -- Sunburn --
Hydrangeas are short-day flowering plants. Under excessive light intensity, their normal growth can be hindered, resulting in black sunburn spots on the leaves. In this case, it is necessary to set up a shade net for the hydrangeas and spray water mist on the leaves.
2. -- Overwatering --
Hydrangeas thrive in moist environments. Ample water promotes plant growth, but excessive watering can damage the roots, leading to poor internal circulation and causing black spots on the leaves. In this case, it is important to improve ventilation and dry excess moisture.
3. -- Fertilizer Burn --
During the maintenance of hydrangeas, avoid fertilizing blindly. Otherwise, excessive fertilizer concentration or frequency can lead to fertilizer burn, affecting the normal development of the leaves. It is recommended to apply a dilute compound fertilizer every 7-10 days.
4. -- Disease Infection --
Hydrangeas can become infected with leaf spot disease under poor ventilation or improper care. Initially, small green spots appear on the leaves, which gradually enlarge and turn into deep brown or black. In severe cases, the entire hydrangea plant may die.
The detailed content about the causes of black spots on hydrangea leaves has been described above. I hope it can be of help to you!