Updated: August 9, 2022

Creeping Jenny (Lysimachia nummularia) is a popular groundcover plant that is well-known for its bright green, trailing foliage. It is a low-maintenance plant that is ideal for rock gardens, borders, and water features. However, like all plants, it can suffer from various issues that can affect its health and appearance. One of the most common problems that creeping Jenny plant owners face is brown spots on the leaves.

Reasons for Brown Spots on Creeping Jenny Plants

There are several reasons why your creeping Jenny plant may develop brown spots on the leaves. The following are some of the most common causes:

1. Overwatering

Creeping Jenny plants prefer moist soil, but they don’t like to be overwatered. When you overwater your plant, it can lead to root rot, which in turn can cause brown spots on the leaves. To prevent this issue, make sure you water your plant only when the topsoil feels dry to the touch.

2. Fungal Infection

Fungal infections can also cause brown spots on creeping Jenny leaves. These infections are more common in humid environments and in plants that are overcrowded or have poor air circulation. To avoid this issue, make sure you space out your plants properly and prune them regularly to ensure proper airflow.

3. Sunburn

Creeping Jenny plants prefer partial shade but can tolerate some direct sunlight. However, if your plant is exposed to too much direct sunlight, it can develop brown spots on the leaves due to sunburn. To prevent this issue, make sure you place your plant in an area where it gets partial shade during the hottest hours of the day.

4. Pests

Pests such as spider mites and aphids can also cause brown spots on creeping Jenny leaves. These pests feed on the sap of the plant, which can cause discoloration and damage to the leaves. To prevent this issue, make sure you inspect your plant regularly and treat it with insecticide if necessary.

How to Treat Brown Spots on Creeping Jenny Plants

If your creeping Jenny plant has brown spots on the leaves, there are several things you can do to treat the issue. The following are some of the most effective treatments:

1. Prune Affected Leaves

The first step in treating brown spots on creeping Jenny leaves is to prune affected leaves. This will prevent the spread of the issue and encourage the growth of healthy new leaves.

2. Adjust Watering

If overwatering is the cause of brown spots on your plant, adjust your watering schedule to ensure that the soil is moist but not waterlogged.

3. Apply Fungicide

If a fungal infection is causing brown spots on your plant, apply a fungicide according to the instructions on the label.

4. Provide Adequate Sun Protection

If your plant is experiencing sunburn, provide it with adequate shade during the hottest hours of the day.

5. Use Insecticide

If pests are causing brown spots on your plant, use an insecticide according to the instructions on the label.

FAQ

Can I still eat my creeping Jenny plants if they have brown spots on them?

It is not recommended to eat plants that have brown spots as they may be diseased or contaminated.

Can I save my creeping Jenny plant if it has severe brown spots?

Depending on the severity of the issue, it may be difficult to save your plant. However, pruning affected leaves and providing proper care can help improve the health and appearance of your plant.

Can I prevent brown spots from occurring on my creeping Jenny plants?

Yes, you can prevent brown spots from occurring by providing proper care, including regular watering, pruning, and pest control measures. Additionally, make sure you place your plant in a location that provides adequate shade and airflow.