Purslane Weed Control: Why This Succulent Invader Thrives in Missouri Lawns and Gardens

Purslane (Portulaca oleracea) is the weed that laughs at drought. While your tall fescue is going brown and dormant in a Missouri dry spell, purslane is thriving — its thick, succulent leaves store water like a camel’s hump. If you’ve noticed a low-growing plant with reddish stems, fleshy green leaves, and small yellow flowers spreading across bare patches in your lawn or garden beds, you’re looking at common purslane. And it’s tougher to control than it looks.

What Is Purslane?

Common purslane is a summer annual broadleaf weed found throughout the United States, but it’s especially well-adapted to Missouri’s climate pattern of wet springs followed by hot, dry summers. While most weeds struggle during drought, purslane shifts into a higher gear.

Key purslane facts:

• Growth habit: Low, spreading succulent that forms dense mats up to 16 inches across
• Leaves: Thick, fleshy, paddle-shaped, arranged alternately on stems
• Stems: Reddish-pink, smooth, succulent, radiating from a central taproot
• Flowers: Small, bright yellow, 5-petaled, open only in direct sunlight
• Seed production: A single plant produces up to 50,000 tiny black seeds
• Drought survival: Stores water in thick leaves and stems, can survive weeks without rainfall
• Seed viability: Seeds remain viable in soil for 20-40 years

How to Identify Purslane (vs. Lookalikes)

Purslane has a few weedy lookalikes that are easy to confuse it with. Here’s how to tell them apart:

Feature	Purslane	Spotted Spurge	Prostrate Knotweed
Leaves	Thick, succulent, paddle-shaped	Thin, flat, oval with red spot	Slender, blue-green, alternate
Stems	Reddish-pink, thick, smooth	Reddish, thin, hairy	Wiry, wiry, jointed at nodes
Sap	Clear, watery	Milky white (key difference!)	Clear
Flowers	Yellow, 5 petals, small	Tiny, white/pink, inconspicuous	Tiny, white/pink, in leaf axils
Growth	Forms thick succulent mats	Flat, circular mats	Upright-spreading, not succulent
Edible?	Yes — eaten worldwide	No — toxic to some animals	No

The foolproof identification test: Break a stem. If milky white sap oozes out, you have spotted spurge, not purslane. Purslane sap is clear and watery. Also, purslane leaves feel thick and rubbery between your fingers, like a succulent houseplant — spurge and knotweed leaves are paper-thin by comparison.

Why Purslane Thrives in St. Charles County

Purslane has several biological advantages that make it one of the most successful weeds in Missouri lawns and gardens:

It’s a succulent. Purslane uses a specialized photosynthesis called CAM (Crassulacean Acid Metabolism) — the same process that allows cacti to survive deserts. It opens its leaf pores at night to collect CO₂ rather than during the day, dramatically reducing water loss during Missouri’s hot afternoons.

It loves disturbed, thin soil. Purslane rarely invades thick, healthy turf. It targets bare patches, garden beds, mulch edges, cracks in driveways and sidewalks, and any area where grass is thin or absent. If you have purslane, you have an opportunity to improve your turf density.

Seeds last decades. Purslane seeds are among the longest-lived weed seeds in existence. They can remain viable in soil for 20-40 years, meaning every plant you allow to go to seed is creating a problem that will outlast your mortgage.

Roots regenerate from fragments. If you hoe or till purslane and leave plant pieces in contact with moist soil, they can re-root and grow into new plants within days. This makes mechanical control tricky.

It grows FAST. Purslane can flower and set seed within 3-4 weeks of germination. In Missouri’s summer, that means multiple generations per season are possible if left unchecked.

How to Kill Purslane

Pre-Emergent Prevention

Pre-emergent herbicides labeled for purslane control include:

Product	Active Ingredient	Application Timing	Notes
Preen	Trifluralin	Early spring before germination	Garden beds and ornamental areas
Isoxaben (Gallery)	Isoxaben	Fall or early spring	Lawn-safe, broadleaf pre-emergent
Pendimethalin (Pendulum)	Pendimethalin	Early spring	Labeled for both lawns and landscape beds
Dithiopyr (Dimension)	Dithiopyr	Mid-April	Early post-emergent activity on young purslane

In Missouri, apply pre-emergents when soil temperatures reach 50-55°F (typically mid-April) for the first germination window. Purslane continues germinating through summer, so a single spring application provides only partial control.

Post-Emergent Control

Once purslane is actively growing, post-emergent herbicides become the primary tool:

For lawns (selective herbicides):

Herbicide	Active Ingredients	Effectiveness	Notes
2,4-D + dicamba + MCPP	Three-way broadleaf mix	Good on young plants	Standard broadleaf weed control for cool-season lawns
Triclopyr (Turflon)	Triclopyr	Good to Excellent	Often more effective than 2,4-D on succulent weeds
Mesotrione (Tenacity)	Mesotrione	Good	Safe on tall fescue and KBG. Best on seedlings.
Carfentrazone (Quicksilver)	Carfentrazone	Excellent	Fast-acting contact herbicide. Works well on succulents.

For garden beds and non-lawn areas (non-selective):

Herbicide	Active Ingredient	Notes
Glyphosate	Glyphosate	Non-selective — kills everything. Use with caution near desirable plants.
Glufosinate	Glufosinate	Fast-acting alternative. Less systemic movement than glyphosate.
Pelargonic acid	Pelargonic acid (organic)	Contact burn-down only. Multiple applications needed.

Application tips for purslane:

• Purslane’s thick, waxy leaf cuticle resists herbicide absorption — add a non-ionic surfactant to improve uptake
• Apply when purslane is actively growing (temperatures below 90°F)
• Young, actively growing plants are much more susceptible than mature, drought-stressed plants
• Repeat applications 10-14 days apart may be necessary for mature infestations
• Water stress reduces herbicide effectiveness — irrigate 1-2 days before application if soil is dry

Non-Chemical Control

Hand-pulling is surprisingly effective on purslane if done right:

1. Pull when soil is moist (after rain or irrigation)
2. Grasp the plant at the base — the central taproot must come out
3. Remove pulled plants from the area entirely — purslane fragments will re-root
4. Do NOT compost pulled purslane with seed heads (seeds survive typical home compost temperatures)
5. Pull before flowering — once yellow flowers appear, seeds follow within days

Mulching in garden beds suppresses purslane seed germination:

• 3-4 inches of wood chips, shredded bark, or straw
• Landscape fabric can help but seeds blow in on top of fabric

Solarization for heavily infested garden areas:

• Cover area with clear plastic sheeting for 4-6 weeks in June-July
• Soil temperatures under plastic reach 110-125°F, killing seeds in the top 2-3 inches

Improve turf density to crowd out purslane:

• Overseed thin lawn areas in fall with tall fescue at 6-8 lbs per 1,000 sq ft
• Proper fertilization produces dense turf that physically excludes purslane
• Correct soil pH (6.0-6.5 for tall fescue) to give desirable grass the competitive edge

An Interesting Fact: Purslane Is Edible

Unlike almost every other lawn weed, purslane is actually a culinary plant in many cultures. It’s cultivated as a vegetable throughout the Mediterranean, Middle East, India, and Mexico. Purslane has more omega-3 fatty acids than any other leafy green plant — higher than some fish oils — along with significant amounts of vitamins A, C, and E, plus magnesium, calcium, and potassium.

It has a slightly lemony, peppery taste and a crisp texture that works in salads, stir-fries, and soups. It’s also a key ingredient in the Mexican dish verdolagas con cerdo (purslane with pork).

Important caution: Only eat purslane from your own property where you KNOW no herbicides or pesticides have been applied. Never eat plants from unknown sources, and be absolutely certain of your identification — spotted spurge (the lookalike) is toxic.

Preventing Purslane from Returning

The most effective long-term purslane strategy combines three approaches:

1. Build thick, healthy turf. Purslane cannot compete with dense grass. Core aeration, proper fertilization, overseeding, and correct mowing height (3-4 inches for tall fescue) create conditions where purslane can’t establish.

2. Mulch bare areas. Every bare patch in your landscape is a purslane welcome mat. Mulch garden beds deeply and repair thin lawn areas promptly.

3. Never let it go to seed. One purslane plant = 50,000 seeds that last 20-40 years. Remove every plant before flowers appear. This is the single most important rule.

When to Call a Professional

Professional purslane control makes sense when:

• You have widespread infestation across multiple areas of your property
• Hand-pulling and DIY herbicides haven’t controlled the problem
• You want a comprehensive weed management program that includes pre-emergents, post-emergents, and lawn thickening
• Your lawn has multiple weed species requiring different treatment approaches
• You don’t want to store or handle herbicide concentrates

Midwest Lawn Care’s approach to purslane focuses on the root cause: thin turf and bare soil. We combine spot-treatment herbicides with aeration, seeding, and fertilization to build lawn density that naturally excludes purslane — so you’re not fighting the same battle every summer.

Get a quote for weed control →

Frequently Asked Questions

Is purslane the same as spurge? No. They’re different plants. Purslane has thick, succulent leaves and clear sap. Spotted spurge has thin leaves and oozes milky white sap when stems are broken. The sap test is the quickest way to tell them apart.

Can I eat the purslane in my lawn? Only if you’re 100% certain of the identification (confirm clear sap, not milky) and you know the area has never been treated with herbicides or pesticides. When in doubt, don’t eat it.

Why does purslane grow in my garden but not in my thick lawn? Purslane needs bare soil and direct sunlight to germinate. Dense turf shades the soil surface and physically blocks purslane seedlings. This is why improving lawn density is your best long-term control strategy.

Does pulling purslane work? Yes, but you must remove the entire root system and dispose of pulled plants away from soil. Purslane fragments left on moist soil can re-root within days.

How long do purslane seeds survive in soil? 20-40 years. This is why preventing seed production is critical. Every plant you let flower is creating a multi-decade problem.

---

Last updated: May 23, 2026. Based on University of Missouri Extension weed science research and local St. Charles County field experience. Weed identification guidance cross-referenced with MU Weed Science program materials.