There are many species of ageratum you can use in the garden. Generally used as annuals, these are also known as floss flowers for their wispy, delicate petals. Height of varieties vary, but most ageratum types grow in low mounds with abundant flowers. They are great in borders, beds, and window boxes and, yet, they do have their problems. Learn how to troubleshoot and manage these to grow healthy, beautiful ageratum flowers.
How to Grow Healthy Ageratums
Ageratum problems can be largely prevented if you grow these plants under the right conditions. They need full sun and will tolerate only very light shade.
The soil should drain very well but remain moist most of the time. The soil should also be fertile and amended with compost, if necessary.
Deadhead spent flowers for more blooms and to reduce disease risk.
Troubleshooting Problems with Ageratum
With the right conditions, this plant is relatively trouble free, but there are some ageratum plant issues that may plague your beds and borders. Know what to look for and how to prevent and manage these problems.
Fungal issues
Fungal diseases such as powdery mildew, gray mold, or Pythium may occur in and cause damage to your ageratum plants. Signs include white growth on leaves and flowers and damping off of stems at the soil level. Plants may wilt and die.
The best way to manage fungal infections is to use drip irrigation. This prevents the splashing of water and fungal spores onto leaves and stems that overhead watering can cause. Good circulation between plants for air flow is also important and keep mulch from getting too close to the stems.
Insect damage
Ageratum may also suffer damage from insects. Thrips, aphids, and spider mites feed on the leaves. You’ll see silver gray spots at feeding sites or yellow spots on the undersides of leaves. If the infections are bad, the plant will wither and even die.
Aphid feeding may cause leaves to curl. Aphids can also be problematic because they produce honeydew. This can lead to sooty mold infections. To manage these problems, you can try appropriate fungicides or pesticides.
The best way to grow healthy ageratum plants is to provide the right conditions. Weakened plants are more likely to be infested by pests, while poor air circulation and too much water triggers fungal infections.
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