how to get rid of lily of the valley plants

3 min read 11-12-2024

how to get rid of lily of the valley plants

Lily of the valley (Convallaria majalis) is a beautiful but notoriously invasive plant. Its charming bell-shaped flowers and sweet fragrance belie its tenacious nature. Once established, these plants can be incredibly difficult to remove completely. This comprehensive guide will walk you through effective methods for eradicating lily of the valley from your garden, ensuring you reclaim your space from this persistent groundcover.

Understanding Lily of the Valley's Persistence

Before we delve into removal methods, it's crucial to understand why lily of the valley is so hard to get rid of. Its extensive rhizome system, a network of underground stems, allows it to spread rapidly and regenerate easily. Even small fragments of rhizome left behind can sprout new plants. This is why simply pulling up the visible parts is rarely enough.

Methods for Eliminating Lily of the Valley

Several methods can be employed to effectively remove lily of the valley, each with its strengths and weaknesses. Consider combining techniques for the best results.

1. Persistent Digging and Removal

This is a labor-intensive but effective method, particularly for smaller infestations.

Timing is Key: The best time to dig up lily of the valley is in early spring or fall when the soil is moist and the plants are less actively growing.
Careful Excavation: Use a garden trowel or spade to carefully dig up the entire rhizome system. Be meticulous; any remaining pieces will regrow.
Disposal: Dispose of the removed plants in the trash to prevent further spread. Composting is not recommended as the rhizomes may survive and spread.

2. Targeted Herbicide Application

Herbicides can be effective, but they must be used carefully and responsibly.

Glyphosate (e.g., Roundup): A non-selective herbicide that kills all vegetation it contacts. Apply directly to the leaves, avoiding contact with desirable plants. This is best used after digging up as much of the rhizomes as possible, as it helps eliminate any remaining pieces. Always follow the manufacturer's instructions carefully.
Spot Treatment: Focus on applying the herbicide to the lily of the valley plants, avoiding spraying it on other plants.
Repeat Applications: Multiple applications may be necessary for complete eradication.

3. Smothering with Mulch or Cardboard

This is a more environmentally friendly approach.

Thick Layer: Cover the affected area with a thick layer (at least 6 inches) of mulch or several layers of cardboard.
Sunlight Deprivation: This method works by depriving the lily of the valley of sunlight, preventing photosynthesis and eventually killing the plants.
Patience is Key: This method takes time, potentially several growing seasons, to be fully effective.

4. Solarization

This method uses the power of the sun to kill the plants.

Clear Plastic Sheeting: Cover the affected area with clear plastic sheeting during the hottest part of the summer.
Heat Buildup: The sun's heat trapped under the plastic will raise the soil temperature, killing the rhizomes.
Effectiveness: This is most effective in hot, sunny climates.

Preventing Lily of the Valley's Return

Once you've successfully removed the lily of the valley, take steps to prevent its return.

Regular Monitoring: Keep a close eye on the area for any new sprouts.
Immediate Removal: Remove any new plants immediately to prevent them from establishing themselves.
Competitive Planting: Plant densely growing groundcovers to compete with any remaining rhizomes and prevent regrowth.

Frequently Asked Questions (FAQs)

Q: How long does it take to get rid of lily of the valley?

A: Complete eradication can take several months or even years, depending on the size of the infestation and the method used. Persistence is key!

Q: Is it safe to compost lily of the valley?

A: No, it is not recommended to compost lily of the valley. The rhizomes can survive composting and spread to other areas of your garden.

Q: What are some good ground covers to plant after removing lily of the valley?

A: Consider planting aggressive, spreading groundcovers such as pachysandra, creeping phlox, or bugleweed to help prevent regrowth.

By employing these methods and remaining vigilant, you can successfully eliminate lily of the valley and enjoy a weed-free garden. Remember that patience and persistence are key to winning this battle against this tenacious plant.