Brown Hydrangeas: 6 Common Causes and Solutions to Prevent Plant Catastrophe
Hydrangeas, with their vibrant blooms, are a popular choice for many gardens. However, these beautiful plants can encounter various issues that may cause their leaves to turn brown. This article aims to provide a comprehensive guide on identifying and addressing common problems that affect hydrangeas.
During heatwaves in mid to late summer, too much sun can cause scorched, brown edges on leaves or flowers that are quickly fading to brown, particularly for mopheads and lacecap hydrangeas. To mitigate this, consider using a shade cloth for in-ground plants to provide shade during hot days. A shade cloth can be easily found on Amazon.
Overwatering is another common issue that can cause leaves to turn brown and mushy, potentially leading to root rot and the death of the shrub. Conversely, underwatering can cause leaves to crisp up with brown edges and flowers to droop, particularly for panicle and mophead hydrangea varieties, especially during peak summer or after planting.
To fix underwatering, water hydrangeas at the base using a hose or drip irrigation system, aiming for 1-2 inches of water a week, and add bark mulch around the roots to hold moisture in. On the other hand, to fix overwatering, ease up on watering, let the soil dry out a bit, boost drainage by mixing in sand or using a raised bed, and test with a moisture meter.
The region of the garden where a hydrangea is planted can also impact its health. Planting in too sunny or dry locations causes leaf browning from stress or sunburn, while shaded or well-watered spots help maintain healthy leaves. Older plants can handle more water and sun over time, so give them a chance to adapt before overwatering or exposing to too much sun.
Common garden pests like aphids or spider mites can also cause brown spots on leaves. Use a soapy water mix (1 teaspoon of pure soap per gallon of water) or neem oil to treat. Dr. Bronner's Castile Soap and pure neem oil can be found on Amazon.
Fungal infections such as anthracnose can cause brown spots or a powdery coating on leaves. Use a natural homemade fungicide or copper fungicide (like the one from Amazon) to treat. It's also essential to prune off affected leaves from plants with fungal infections to prevent disease spread.
Lastly, avoid moving or planting hydrangeas during summer to minimize transplant shock. Fall or spring is easier on them. Transplant shock can cause brown, wilting leaves or droopy flowers after transplanting. Water deeply before and after transplanting, keep soil moist for a few weeks, and use a shade cloth (like the one from Amazon) to ease stress.
Remember, it's crucial not to compost affected leaves to prevent disease spread. By understanding and addressing these common issues, you can ensure your hydrangeas thrive and continue to add beauty to your garden.
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