Evergreen Seeds

I often encounter questions on the nature of dollarweed, particularly whether it’s a nuisance in gardens and lawns. To answer plainly, dollarweed, also known as pennywort, is frequently seen as an unwelcome plant due to its aggressive growth habits and its indication of potentially larger issues in your outdoor space. Its round, shiny leaves connected by slender, creeping stems may appear innocuous at first, but its presence can swiftly become overwhelming, especially in moist environments.

Dollarweed invades the garden, choking out other plants

While some gardeners might not favor dollarweed, it’s important to acknowledge that it only prospers under certain conditions – typically where there is excessive moisture. Whether it’s due to over-irrigation, poor drainage, or simply a naturally damp climate, the persistent appearance of dollarweed suggests that these underlying factors need to be addressed. Managing water levels in your garden is a critical component in controlling dollarweed, where a proper balance can prevent it from taking over.

Contrary to merely viewing dollarweed as an adversary, I see its emergence as an important indicator. It points out that adjustments could be made to enhance the overall health and aesthetic of a lawn or garden. By carefully considering our gardening practices and making informed decisions on moisture management, we can create an environment that is less hospitable to dollarweed, nurturing a more diverse and balanced outdoor ecosystem.

💥 Quick Answer

Dollarweed, also known as pennywort, is not inherently bad, but its aggressive growth can be problematic for lawns and gardens.

Identifying Dollarweed and Its Growth Habits

In this section, I’ll discuss the distinct features that help in identifying dollarweed, and explain its preferred habitat and growth pattern that enables its prolific spread.

Characteristics of Dollarweed

💥 Dollarweed, known scientifically as Hydrocotyle spp., features fleshy, round leaves with scalloped edges.

Often confused with lily pads due to their shape, dollarweed leaves are bright green and usually measure 1-2 inches in diameter. They are low to ground and have a shiny appearance, often emerging in warm seasons. Due to their high water content, they can also be referred to as water-loving plants. Another name for dollarweed is pennywort, which is sometimes used interchangeably.

Dollarweed Habitat and Spread

💥 Dollarweed thrives in wet, poorly drained areas and spreads both by seeds and tubers.

You’ll frequently find this plant in coastal regions or in lawns with consistent moisture, where it exhibits a creeping growth habit. Its ability to propagate through multiple methods, including rhizomes, allows it to cover large areas quickly, often leading to challenges in eradication. Proper lawn care involving drainage improvement and occasional drying out of the soil can help control the spread of dollarweed.

Best Cultural Practices for Lawn Health

In maintaining a healthy lawn, it is crucial to apply the best cultural practices that promote vigorous turf while mitigating weed issues, such as the problematic dollarweed. Precision in irrigation, mowing, and fertilization can collectively enhance lawn health and suppress the growth of unwanted plants.

Maintaining Proper Irrigation

I keep my lawn’s moisture levels in check to prevent the conditions that favor dollarweed growth. By reducing my irrigation frequency, I ensure the soil is not persistently wet, which would otherwise invite dollarweed. Here’s how I manage my lawn’s water needs:

🚰 Water Requirements

I water my lawn deeply but infrequently, promoting deeper root growth and reducing the incidence of shallow-rooted weeds like dollarweed.

Effective Mowing Techniques

Proper mowing is essential to keep dollarweed at bay. I always use a sharp mower blade and adhere to the recommended mowing height for my grass type:

Mowing Tips:
  • Grass Type: Match cutting height with grass species requirements.
  • Cutting Frequency: Mow based on grass growth, not on the calendar.

Optimizing Fertilization

I fertilize my lawn judiciously to maintain turf health without promoting weed growth:


I ensure that the fertilizer I use is formulated for my specific type of turf and that it is applied at the right time of year to avoid excessive growth and weed problems.

Chemical Control of Weeds

When I employ chemical weed control strategies, I choose herbicides based on the weed type and the environmental impact. Proper selection and application are paramount to ensure the safety of surrounding plants and minimize ecological disruption.

Selective Herbicide Use

I find that selective herbicides, like 2,4-dichlorophenoxyacetic acid (2,4-D) and imazaquin, are essential when I need to target specific weeds without harming the surrounding grass or plants. Atrazine and dicamba are also effective selective herbicides. For instance, when dealing with broadleaf weeds within a lawn, I would opt for a herbicide that targets broadleaf plants but does not affect the grass.

💥 Note: It’s crucial to follow the manufacturer’s instructions for application rates and timing to ensure that these herbicides only affect the intended weeds.

Non-Selective Herbicide Safeguards

For areas where all vegetation needs to be controlled, such as driveways or sidewalks, I might choose non-selective herbicides like glyphosate. A well-known non-selective herbicide is Roundup. However, I use these products with caution due to their broad-spectrum activity—they can harm any plant they contact.

⚠️ Warning

Care should be taken to apply these herbicides only on calm days to prevent drift to desirable plants and always wear appropriate protective equipment.

Integrated Dollarweed Management

💥 Key Concept

Integrated Dollarweed Management (IDM) is a comprehensive approach to controlling Dollarweed in lawns. It combines various strategies to reduce this weed’s presence and prevent its spread, while ensuring the health of turf like St. Augustine, zoysia, and Bermuda grasses.

📝 Recommended Steps
  • ✂️ Mow correctly: Keep grass at the appropriate height to encourage thick growth that shades out Dollarweed.
  • 🚰 Irrigation: Reduce excessive moisture that promotes Dollarweed by watering only when necessary.
  • 🤎 Soil health: Improve drainage to address wet areas where Dollarweed thrives.
  • Fertilization: Apply the right amount of fertilizer to avoid overfeeding, which Dollarweed benefits from.
  • 🔆 Sunlight: Dollarweed favors shady, moist spots, so increasing sunlight can deter its growth.

Leveraging the advice of experts like the University of Florida is essential. They recommend a balanced application of herbicides alongside cultural methods to sustain a healthy lawn. Using pre-emergent herbicides can prevent Dollarweed seeds from sprouting, while post-emergent options target existing weeds without damaging the turf.

⚠️ Safety Precaution

Remember to wear Personal Protective Equipment (PPE) when applying chemical treatments to protect yourself.

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