Weeds With Small Purple Flowers: Identify, Manage, and Live With Them
If you’ve ever looked down at your lawn or garden and spotted little pops of purple among the green, you’re not imagining it—many common weeds produce small purple flowers that can either charm you or drive you mad, depending on how dedicated you are to a perfectly manicured bed. I’ve been gardening for years, and I’ve learned to recognize the usual suspects, know their habits, and decide which ones I tolerate and which I wrestle out by the roots.
Why these weeds matter
Small purple flowers might look delicate, but these plants are often resilient. They can spread quickly, set seed, or creep along the soil and outcompete your desired plants. On the flip side, many of them are beneficial to pollinators early in spring when flowers are scarce. The trick is identifying which one you’re dealing with so you can manage it appropriately.
Common lawn and garden weeds with small purple flowers
- Ground Ivy (Glechoma hederacea) — Also called creeping Charlie. Rounded, scalloped leaves and a creeping habit. Flowers are tubular and purple to lavender, usually in clusters along the stems in spring. It forms dense mats and roots at the nodes.
- Henbit (Lamium amplexicaule) — A member of the mint family with square stems and opposite leaves that often hug the stem. The throat-shaped flowers are small and purple-pink; plants are upright but can sprawl. Common in lawns and disturbed soil in spring.
- Purple Dead-nettle (Lamium purpureum) — Often confused with henbit but has more triangular, often purple-tinged upper leaves. Flowers are tubular and purple, and it flowers in early spring. It’s not stinging despite the name.
- Selfheal (Prunella vulgaris) — Low-growing with spikes of small purplish flowers. Leaves are opposite and mildly hairy. Found in lawns, paths, and compacted soils; helpful to bees.
- Speedwells (Veronica spp.) — Includes Persian speedwell (Veronica persica) and slender speedwell (Veronica filiformis). Small, saucer-like flowers in blue to purple shades with a white center. Leaves vary but are often toothed and roundish. They spread by seed and creeping stems.
- Wild Violets (Viola sororia and others) — Heart-shaped leaves and solitary purple flowers that sit close to the ground. Violets can be persistent because they produce both seed and creeping rhizomes or stolons in some species.
- Periwinkle (Vinca minor) — Often used as a groundcover, but can be invasive in some areas. Glossy evergreen leaves and slightly larger purple-blue flowers. It spreads by stolons and can smother native plants.
How to tell them apart
Identification comes down to a few simple observations: leaf shape and arrangement, stem type (square stems often indicate mint family), flower shape, and growth habit (creeping versus upright versus clumping). Here are some quick ID tips from my experience:
- If the stem is square and the plant smells slightly minty when crushed, think henbit or purple dead-nettle.
- Small, tubular clustered flowers along horizontal stems with scalloped leaves? That’s likely ground ivy—I’ve dug up patches of it that looked like a green carpet.
- Saucer-like flowers with a distinct white eye are usually speedwells. They’re tiny but bloom prolifically in cool weather.
- Heart-shaped leaves right at the base with solitary purple blossoms? Wild violets.
When to tolerate and when to control
I’ll be honest: I let a few of these stay in my garden early in spring because the bees love them. Purple dead-nettle and henbit are among the first nectar sources after a long winter. But I pull them when they start to set seed or move into areas reserved for perennials. Vinca and ground ivy, on the other hand, I usually remove because they can take over beds.
“A weed is just a plant in the wrong place.”
That quote has guided many of my gardening choices; sometimes the “wrong place” is subjective and seasonal.
Non-chemical control methods I use
- Hand-pulling when the soil is moist. It’s satisfying and effective, especially for small patches. Pull before flowers go to seed.
- Frequent mowing to prevent seed set in lawns. Keeping grass healthy and dense makes it harder for speedwells and henbit to establish.
- Mulching beds to block light and reduce seed germination. A 3–4 inch layer of organic mulch saves me endless weeding later in the season.
- Improve soil and overseed bare spots. Bare soil is an invitation; a thick, healthy lawn crowds out many of these weeds.
- Solarization for persistent patches—covering with clear plastic in hot months can weaken ground ivy and vinca over time.
When to consider chemical controls
I avoid herbicides where possible, but for large infestations of ground ivy or periwinkle, targeted use of post-emergent broadleaf herbicides may be the most practical option. Always follow label instructions, apply when plants are actively growing, and consider spot treatments rather than blanket spraying.
Seasonal timing and lifecycle notes
Most of these purple-flowering weeds bloom in spring, which makes late winter and early spring the best time to plan control: apply pre-emergents for seeders, overseed or patch bare spots, and be ready to pull the first flush of seedlings. For perennial spreaders like periwinkle, fall or spring removal combined with persistent follow-up is necessary.
Final tips from my garden
My approach is always practical: accept a little early spring color if it feeds pollinators, but don’t give up beds to aggressive spreaders. Keep a good toolkit—a weeder, gloves, sharp trowel, and a plan for mulch and reseeding. Learn to identify the plants so your response is targeted and effective.
If you want, send me a picture of the purple-flowered weed in your yard and I’ll help identify it and suggest the best control steps. Sometimes one look is all it takes to solve a garden mystery and save you hours of pulling the wrong plant.
