Quick Answer: How Do I Get Rid of Thistle in My Lawn?
Thistle is tougher than most weeds because of its deep, aggressive roots. Control usually requires:
- Digging out as much root as possible, and
- Targeted weed control applied more than once, and
- Thickening the lawn so new shoots and seedlings have less space.
Why Thistle Is Hard to Control
Q: Why does thistle keep coming back after I cut it?
Because:
- It has deep taproots or extensive root systems
- Cutting the top often just encourages new shoots
- Some species spread via both seeds and roots
Digging Out Thistle
Q: Can I just dig thistle out?
You can, but you need to:
- Use a spade or long weeding tool
- Dig down and remove as much root as possible
- Expect to repeat this—small root pieces can regrow
Hand removal works best on isolated plants or small infestations.
Using Weed Control on Thistle
Q: When should I spray thistle?
Best results usually come when the plant is:
- Young and actively growing, or
- In the rosette stage (low to the ground, before tall stalks form)
Use a selective broadleaf herbicide labeled for thistle. Follow:
- Temperature guidelines
- No‑rain window
- Repeat applications if needed
Preventing Thistle From Returning
Q: How do I stop thistle from spreading again?
- Mow regularly so seed heads don’t mature
- Remove existing seed heads before they fluff out
- Overseed and fertilize to thicken grass
- Address bare patches where thistle can easily establish
Thistle FAQs
Q: Can I get rid of thistle in one season?
A: Sometimes, but often it takes more than one season of consistent control, especially with established patches.
Q: Will mowing alone kill thistle?
A: No. Mowing can weaken it and stop seeds, but the root system typically survives without additional control.