Effective Weed Control in Juniper Ground Cover: Safe Methods for a Weed-Free Slope

Managing Weeds in Established Juniper Ground Cover

Juniper makes an excellent, low-maintenance ground cover for slopes and large areas, but persistent weeds can undermine its beauty and health. Because juniper forms a dense mat over time, the key is to suppress weeds until the plants fully knit together.

Pre-Emergent Prevention with Preen

Apply a pre-emergent herbicide like Preen to bare spots between juniper plants. This product prevents weed seeds from germinating but does not affect established perennial weeds or the juniper itself. Reapply according to label directions until the juniper completely covers the area.

Targeted Spot Treatment for Existing Weeds

For weeds already growing, use a precise spot-treatment method to avoid damaging the juniper:

1. Wear chemical-resistant gloves.
2. Pour a small amount of glyphosate-based herbicide (such as Roundup) into a disposable container.
3. Using a paintbrush, carefully apply the herbicide directly onto the leaves and stems of each weed.
4. Repeat applications may be necessary for deep-rooted perennials.

This brush-on technique minimizes drift and protects the surrounding juniper. If the area is heavily infested, consider shielding the juniper with cardboard or plastic before a directed spray, but the brush method is safest for valuable ground cover.

Long-Term Strategy

Once the juniper forms a continuous mat, it will naturally suppress most new weeds. Maintain vigilance along edges and in any thin spots, and remove weeds promptly before they set seed.