What Is Japanese Clover in Lawns (Selective Control)
Japanese clover, also called common lespedeza, is a low-growing summer annual weed with three leaflets on each leaf. In established lawns, selective control means using a broadleaf herbicide labeled for both the weed and your exact turfgrass. Treat young, actively growing plants, follow the current label, and improve turf care to reduce new seedlings.
A weed in the lawn can be frustrating, but spraying before you know what it is can cause a bigger problem. Japanese clover may look like other low-growing weeds, and a product that is safe on one grass can injure another.
I teach homeowners to check two things before choosing a treatment: the weed’s identity and the lawn’s grass species. Then the product label determines whether treatment is allowed, how to apply it, and when to assess results. There is no universal herbicide rate or schedule for every lawn.
How to identify Japanese clover
Japanese clover is a warm-season annual broadleaf plant. That means it grows during the warmer part of the year and usually completes its life cycle in one season. Correct identification matters because similar-looking weeds may respond differently to treatment.
Look for alternate leaves, meaning leaves attach to the stem one at a time rather than in pairs. Each leaf has three small leaflets. The plant often grows low and spreads along the ground, especially in thin or open turf. It commonly germinates in late spring and can produce seed as it matures.
Common names can cause confusion. Japanese clover is also called common lespedeza; its scientific name is Kummerowia striata, and older references may use Lespedeza striata. Do not rely on the name alone. Compare the leaves and growth habit with a reliable local weed guide or ask a lawn-care professional if you are unsure.
White clover differs in a key way: its leaves often have pale markings and the plant is a perennial, while Japanese clover is an annual. Other weeds may also have three leaflets, so check the full plant and confirm before spraying.
A practical check is to photograph the plant close up and note where it grows, when it appears, and whether the leaves alternate along the stem. If identification remains uncertain, wait to apply herbicide until you have confirmed it.
How selective control works
A selective herbicide targets certain weeds while allowing listed turf species to tolerate the treatment when it is used as directed. Selectivity is not a guarantee for every lawn: it depends on the active ingredients, product formulation, grass type, site, and label directions.
Postemergence herbicides are applied to weeds that have already emerged. Products labeled for Japanese clover may contain ingredients such as 2,4-D, dicamba, MCPP or MCPA, or triclopyr, sometimes in combinations. These are examples of ingredient types, not a recommendation for a particular product.
Before buying or mixing anything, check the current product label for all three of these items:
- The target weed, such as Japanese clover or common lespedeza.
- Your exact turf species, such as Kentucky bluegrass, tall fescue, St. Augustinegrass, or centipedegrass.
- The application site, such as a residential lawn.
Grass tolerance varies. St. Augustinegrass and centipedegrass may have tighter product restrictions than some other turf types. Newly seeded, recently sodded, stressed, or otherwise immature turf can also have special limits. If your lawn type is missing from the label, do not assume the product is safe for it.
Rates, repeat intervals, temperature limits, rain-free periods, and watering directions vary by formulation. Use the current label, not a rate found in an unrelated guide or on a different product. If a label is unclear, contact the manufacturer or a local extension service before applying.
Step-by-step treatment and safety
Safe treatment starts before the sprayer is filled. Confirm the weed and turf, read the entire label, and check weather and site conditions. If any label restriction or safety condition is uncertain, pause rather than guess.
- Inspect and prepare. Check for nearby flowers, shrubs, trees, gardens, and drainage paths where spray or runoff could reach. Review local rules and the label’s limits. Wear the required protective gear, and keep people and pets away for the period the label specifies.
- Set up the application. Use a clean sprayer or spreader suitable for the labeled product. Calibrate it so the application delivers the label rate over the intended area. Add only adjuvants, such as a surfactant, that the label permits.
- Check the weather. Do not apply in wind that could carry spray onto desirable broadleaf plants. Follow the product’s temperature limits and rain-free interval. Avoid conditions where rain or irrigation could wash product away or carry it into drains.
- Apply to suitable weeds. Young, actively growing plants are generally easier to control than mature or seed-bearing ones. Spot-treat when the label allows and the infestation is limited; use a broader application only as directed. Avoid overlap and drift.
- Follow label timing. Some labels advise against mowing immediately before or after treatment. Follow the specific directions rather than applying a general waiting period. Recheck at the label’s stated assessment interval, and repeat only if the label permits it.
A wrong product-to-grass match or off-target drift can injure or kill lawn and landscape plants. Stop if wind, heat, turf stress, or any other condition makes safe application doubtful. Do not spray over desirable broadleaf plants or where runoff is likely.
Treatment choices and field scenarios
The right approach depends on the lawn, the size of the infestation, and the label. These scenarios show how to make the decision; they are examples, not reports of specific lawns or a substitute for checking a product label.
| Situation | Practical next step | Why it matters |
|---|---|---|
| A few young plants in established turf | Confirm the weed and look for a labeled spot-treatment option | Treating only the affected area can limit exposure elsewhere |
| Many young plants in established turf | Check whether a labeled broadcast application is allowed | Coverage and rate must match the product directions |
| St. Augustinegrass or centipedegrass | Find a product label that names that turf species | A product suitable for another grass may injure these lawns |
| Newly seeded or recently sodded lawn | Check establishment and turf-age restrictions first | Young turf may be more sensitive or excluded from use |
| Plants are mature or have seed | Prevent seed spread where practical; check label directions | Mature plants can be harder to control, and seeds can contribute to future growth |
| Weed or lawn identity is uncertain | Get an identification before treatment | Spraying the wrong plant or grass can cause avoidable damage |
If Japanese clover is already producing seed, removing or containing plants where practical can help limit seed spread. Do not pull or mow in a way that spreads mature seed across the lawn. Check local guidance if the infestation is large or difficult to manage.
Check results and prevent a return
After treatment, assess control at the interval stated on the product label. Do not assume that a weed is dead immediately, and do not apply another dose early just because leaves still look green. Follow the label’s repeat-use limits and any interval between applications.
Japanese clover often establishes in thin turf. A dense lawn can make it harder for seedlings to take hold, although lawn care alone may not remove established plants. Mow at a height appropriate for your grass species, irrigate according to the lawn’s needs, and use soil-test results to guide fertilizer use. Avoid adding fertilizer without a reason or using a one-size-fits-all schedule.
Store unused pesticide in its original labeled container in a locked, dry place. Clean the sprayer or spreader as the label directs. Dispose of leftover mixture and rinse water according to label instructions and local rules; do not pour them into a storm drain or where they may reach water.
The safest plan is simple: identify both plant and turf, select only a product labeled for that combination, and follow its directions from preparation through cleanup.
Frequently asked questions
These quick answers cover common decisions about identifying and selectively controlling Japanese clover. Always use the current product label for lawn-specific instructions, since rates, restrictions, and timing vary by formulation and turf species.
Is Japanese clover the same as lespedeza?
Japanese clover is also known as common lespedeza. Its scientific name is Kummerowia striata; older sources may call it Lespedeza striata.
When does Japanese clover usually appear?
It commonly germinates in late spring and grows during warm weather. Timing varies with local conditions.
What does Japanese clover look like?
It has alternate leaves, each with three leaflets, and often grows low and spreading. Confirm the full plant before treatment.
Will a broadleaf weed killer control it?
Some labeled broadleaf products may control it. The label must list the weed, application site, and your turf species.
Can I use the same herbicide on every lawn?
No. Turf tolerance varies. Check the label for your exact grass, especially for St. Augustinegrass, centipedegrass, and young turf.
When should I treat Japanese clover?
Treat small, actively growing plants when weather and label conditions allow. Mature or seed-bearing plants can be harder to control.
Can I apply herbicide before rain?
Only if the label’s rain-free interval will be met. Rain or irrigation too soon may affect treatment or cause runoff.
Should I repeat the application if weeds remain?
Only when the label permits another application, and only after the stated interval. Never exceed the listed rate or application limit.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
