Getting rid of purslane requires a combination of removing existing plants before they set seed and preventing the massive seed bank already in your soil from producing new ones. A single purslane plant can drop over 100,000 seeds, and those seeds survive for years underground, so one season of pulling won’t solve the problem. The good news is that purslane is shallow-rooted and responds well to consistent control methods.
Why Purslane Is So Hard to Eliminate
Purslane’s survival strategy is pure volume. A modest plant about one foot across produces roughly 7,000 seeds. A large, sprawling plant can exceed 100,000. Those tiny black seeds settle into the top layer of soil and wait, sometimes for decades, until conditions are right. Purslane germinates when soil temperatures warm up in late spring and summer, which means every bare patch of warm soil is an invitation.
The plant also regenerates from stem fragments. If you chop it up with a hoe and leave the pieces on moist soil, many of those fragments will re-root within days. This makes careless removal almost worse than no removal at all, because you can accidentally spread it across a wider area.
Hand Pulling and Hoeing
For small infestations, hand pulling is the most effective starting point. Purslane has a single shallow taproot, so it pulls out easily when the soil is moist. The critical rule: remove plants before they flower. Once you see small yellow blooms, seeds are already forming, and the plant can mature seeds even after being pulled if left on the ground.
Gather every pulled plant into a bag or bucket immediately. Don’t toss them onto the soil surface or into a garden path. If you’re using a hoe, scrape just below the soil surface to sever the taproot, then collect the debris. Hoeing works best on hot, dry days when severed plants will desiccate quickly rather than re-root. Check the area again in 7 to 10 days, because new seedlings will emerge from the disturbed soil.
Mulching to Block New Growth
Mulch is your best long-term defense. Purslane seeds need light to germinate, so a thick layer of organic mulch over bare soil stops most of them from sprouting. To be effective, organic mulches need to be at least 3 inches thick. Wood chips, shredded bark, and straw all work. Thinner layers let enough light through to trigger germination, and purslane seedlings can push through a sparse covering.
In vegetable gardens, lay mulch between rows and around established plants after the soil has warmed. Replenish it as it breaks down throughout the season. In flower beds and landscape areas, a layer of wood chips maintained at 3 to 4 inches will suppress purslane along with most other annual weeds. Landscape fabric under the mulch adds extra protection, though it can be impractical in beds where you plant and replant frequently.
Soil Solarization for Heavy Infestations
If an area is overrun with purslane and you can take it out of production for a stretch, soil solarization can kill both existing plants and seeds in the top few inches of soil. Water the area thoroughly, then cover it with a sheet of clear plastic (not black) and seal the edges with soil or rocks. Leave it in place for 4 to 6 weeks during the hottest part of summer.
The trapped solar heat raises soil temperatures high enough to kill purslane seeds near the surface. This works best in regions with strong, consistent summer sun. Cloudy climates or cooler summers reduce effectiveness. After removing the plastic, avoid deep tilling, which brings viable seeds from lower soil layers back to the surface.
Pre-Emergent Herbicides
Pre-emergent herbicides create a chemical barrier in the top layer of soil that kills seedlings as they germinate. For purslane specifically, products containing isoxaben or simazine have consistently provided the best control in university trials. Prodiamine also performed well, particularly later in the season. You apply these in spring before soil temperatures rise enough to trigger germination, typically when you’d normally see the first purslane seedlings appear.
Timing matters more than product choice. Apply too late and the seeds have already sprouted, making the pre-emergent useless. Apply too early and the chemical may break down before the long germination window closes. In most areas, an application in mid to late spring covers the primary flush. A second application 8 to 10 weeks later can extend control through summer, since purslane germinates over a longer window than many weeds.
Pre-emergents only prevent new seedlings. They do nothing to plants already growing, so you’ll need to combine them with hand removal or a post-emergent spray for existing purslane.
Post-Emergent Herbicides for Lawns
If purslane is already growing in your lawn, broadleaf herbicide combinations are effective and won’t harm most common turfgrasses. Look for products that combine two or more of these active ingredients: 2,4-D, dicamba, MCPP, triclopyr, or fluroxypyr. Many common lawn weed killers sold at garden centers use exactly these combinations. Products like Trimec, Speedzone, and Surge all list purslane on their labels.
Spray when purslane is young and actively growing, not during drought stress or extreme heat. Small, younger plants absorb the herbicide more effectively than large, mature ones with thick, waxy leaves. A second application 10 to 14 days later may be needed for larger plants. In garden beds rather than lawns, these broadleaf herbicides will also kill your flowers and vegetables, so they’re only appropriate for turf areas.
Don’t Compost Pulled Purslane
Tossing purslane into your backyard compost bin is risky. Purslane seeds are remarkably heat-tolerant. Research on composting temperatures found that purslane seeds were unaffected at 108°F and 115°F, temperatures that kill many other weed seeds. Most home compost piles don’t sustain high enough temperatures uniformly, especially at the edges and surface, to destroy purslane seeds. If those seeds survive, you’ll spread purslane across your garden the next time you use the compost.
Bag pulled purslane and dispose of it with yard waste pickup, or leave it on a hot, dry concrete surface for several days until it’s completely desiccated before adding it to compost. The succulent stems hold a surprising amount of moisture, which is what allows fragments to re-root.
A Long-Term Control Strategy
Because purslane’s seed bank is so massive, eradication in a single season isn’t realistic. The goal is to prevent new seeds from entering the soil while gradually depleting what’s already there. Each year that you remove plants before they flower and maintain thick mulch, fewer seeds remain viable underground.
In lawns, the best defense is a thick, healthy turf. Purslane thrives in thin, bare, or compacted areas where it gets the light and warmth it needs. Overseeding bare spots, mowing at the higher end of your grass type’s range, and correcting compaction through aeration all reduce the openings purslane exploits. In garden beds, consistent mulching and prompt removal of any plants that appear will bring the population down year over year.
One side note worth knowing: purslane is actually edible and nutritious. Its leaves contain 300 to 400 milligrams of omega-3 fatty acids per 100-gram serving, more than spinach. Some gardeners who can’t fully eliminate it decide to harvest the young leaves for salads instead, turning a persistent weed into a free crop. That’s obviously not a weed control strategy, but it can take some of the sting out of the battle.