My New Cabaret Grass Is Turning Brown

Proper Planting and Site

• This Miscanthus cultivar requires well drained soil in full sun but it can be grown in partial shade. The grass requires consistently moist soil at planting and until it is established, at which time it has limited drought tolerance. The foliage will discolor if it is moisture stressed before it has spread out roots. The grass cannot be planted with its roots in the water table or in boggy soil. Plant the grass with its roots just covered by soil and the foliage and crown above the ground for proper air circulation and to prevent rot.

Miscanthus Blight

• Miscanthus blight can affect any ornamental maiden grass. The disease is a fungal problem that causes brown necrotic spots on the blades of the foliage. Fungal diseases on leaves are often caused by overhead watering, crowded plants and warm, humid weather conditions. Fungal diseases rarely kill the grass but can make the foliage unsightly. Fungicides applied in spring can offer some control.

Time of Year

• Cabaret will die back if planted in a zone lower than USDA 6. In zone 5 it will likely survive if it is planted in a heavily mulched, sheltered location. In chilly temperatures, the plant's foliage will turn tan to brown. This can be left to add winter interest to your landscape and help protect the crown of the grass from the cold. In late winter or early spring, cut back the foliage and a new batch of leaves will arise.

Mealybugs

• Mealybugs are common plant pests on both interior and exterior plants. They are sucking insects that can seriously reduce the vigor of the grass. Their feeding activities cause discoloration and damage growth. They are tiny, cottony bugs that resemble pillbugs. Nymphs are so small you will likely not spot them. They leave purplish brown spots on the tops of the leaves and a waxy white substance on the undersides. The chemical Imidacloprid has been shown to be effective when sprayed early in the infestation.