Flowering weeds in Maryland are frequently found in lawns, with the small white blossoms of chickweed being a common sight. These plants pop up in gardens, along sidewalks, and in fields, often catching you off guard. Knowing what they are helps you manage them better or appreciate their role in the local ecosystem.
Maryland’s climate supports a wide variety of flowering weeds. From early spring to late fall, different species take turns blooming. Some are invasive, while others are native and beneficial for pollinators. This guide walks you through the most common ones, how to identify them, and what to do about them.
Common Flowering Weeds In Maryland Lawns
Your lawn is a prime spot for flowering weeds. They thrive in disturbed soil, thin grass, or areas with poor drainage. Here are the usual suspects you will see.
Chickweed
Chickweed has small, white, star-shaped flowers. It forms dense mats that hug the ground. You will notice it in early spring and fall when temperatures are cool. It spreads quickly from seeds and stem fragments.
- Leaves: Small, oval, pointed at the tip
- Flowers: Five deeply notched petals
- Growth habit: Low, creeping, forms thick mats
- Control: Hand pull when soil is moist, or use pre-emergent herbicide in late summer
Dandelion
Everyone knows the bright yellow flower of a dandelion. It turns into a puffball of seeds that blow in the wind. Dandelions have a deep taproot that makes them hard to remove completely. They bloom from early spring through fall.
- Leaves: Deeply toothed, forming a rosette at the base
- Flowers: Single yellow head on a hollow stem
- Growth habit: Upright, with a long taproot
- Control: Dig out the entire taproot, or apply a broadleaf herbicide
White Clover
White clover has round, white flower heads that bees love. It spreads by runners and fixes nitrogen in the soil. Many people actually want clover in their lawn because it stays green without much water. But if you prefer a uniform grass lawn, it can be a nuisance.
- Leaves: Three oval leaflets, often with a white chevron
- Flowers: Round, white to pinkish heads
- Growth habit: Creeping, forms patches
- Control: Improve soil fertility, or use a selective herbicide for clover
Ground Ivy
Ground ivy has purple, funnel-shaped flowers and a strong minty smell when crushed. It spreads aggressively in shady, moist areas. The leaves are round with scalloped edges. It can quickly take over large sections of lawn.
- Leaves: Round, scalloped, opposite on square stems
- Flowers: Purple, tubular, in clusters
- Growth habit: Creeping, roots at nodes
- Control: Improve sunlight and drainage, apply herbicide in fall
Flowering Weeds In Maryland Gardens
In flower beds and vegetable gardens, weeds compete with your plants for water and nutrients. Here are the most persistent ones.
Purslane
Purslane has small, yellow flowers and thick, succulent leaves. It grows low to the ground and thrives in hot, dry conditions. The stems are reddish and fleshy. You can actually eat purslane in salads, but it spreads fast if left unchecked.
- Leaves: Thick, oval, fleshy, alternate
- Flowers: Small, yellow, five petals
- Growth habit: Prostrate, forms dense mats
- Control: Mulch heavily, hand pull before it seeds
Spotted Spurge
Spotted spurge has small, pinkish flowers and leaves with a reddish spot in the center. It grows flat against the ground. When you break a stem, it oozes a milky sap that can irritate skin. It loves hot, dry, compacted soil.
- Leaves: Small, oval, opposite, with a red spot
- Flowers: Tiny, pinkish, in leaf axils
- Growth habit: Prostrate, forms a dense mat
- Control: Improve soil aeration, use pre-emergent in spring
Lambsquarters
Lambsquarters can grow several feet tall. It has small, greenish flowers clustered along the stem. The leaves are diamond-shaped with a whitish, powdery coating on the underside. It is a prolific seeder, so one plant can cause problems for years.
- Leaves: Diamond-shaped, toothed, with white powder
- Flowers: Small, green, in dense clusters
- Growth habit: Upright, branching
- Control: Pull before flowering, use mulch to block light
Bittercress
Bittercress has tiny white flowers with four petals. It forms a low rosette of leaves that are compound and somewhat fern-like. It sets seed quickly in early spring. The seed pods explode when touched, scattering seeds everywhere.
- Leaves: Compound, with rounded leaflets
- Flowers: Small, white, four petals
- Growth habit: Low rosette, then upright flower stalks
- Control: Pull before seed pods form, apply pre-emergent in fall
Invasive Flowering Weeds In Maryland
Some flowering weeds are not just annoying; they are invasive and harm local ecosystems. These species outcompete native plants and reduce biodiversity.
Japanese Knotweed
Japanese knotweed has tall, bamboo-like stems and clusters of creamy white flowers in late summer. It spreads aggressively through underground rhizomes. It can damage building foundations and roads. This weed is extremely hard to eradicate.
- Leaves: Large, heart-shaped, alternate
- Flowers: Creamy white, in plume-like clusters
- Growth habit: Upright, can reach 10 feet tall
- Control: Requires professional treatment, often with repeated herbicide applications
Garlic Mustard
Garlic mustard has small, white, four-petaled flowers. The leaves smell like garlic when crushed. It grows in shaded areas and invades forest understories. It produces hundreds of seeds per plant, which remain viable for years.
- Leaves: Heart-shaped, toothed, with garlic smell
- Flowers: Small, white, four petals
- Growth habit: Biennial, forms rosette first year, flowers second year
- Control: Pull entire plant including roots, bag and dispose of flowers
Purple Loosestrife
Purple loosestrife has tall spikes of bright purple flowers. It grows in wet areas like ditches and pond edges. It crowds out native wetland plants and reduces habitat for wildlife. It is illegal to sell or plant in Maryland.
- Leaves: Lance-shaped, opposite or whorled
- Flowers: Purple, with 5-6 petals, in dense spikes
- Growth habit: Upright, 3-7 feet tall
- Control: Hand pull small infestations, use biocontrol beetles for large areas
Canada Thistle
Canada thistle has purple, pom-pom-like flowers. It spreads by deep roots and can form dense colonies. The leaves are spiny and lobed. It is a noxious weed in Maryland, meaning you are required to control it.
- Leaves: Spiny, lobed, alternate
- Flowers: Purple, in clusters at stem tips
- Growth habit: Upright, 2-5 feet tall
- Control: Mow repeatedly, apply systemic herbicide in fall
Beneficial Flowering Weeds For Pollinators
Not all flowering weeds are bad. Some provide food for bees, butterflies, and other beneficial insects. Consider leaving these if they are not causing problems.
Red Clover
Red clover has round, pinkish-red flower heads. It is a favorite of bumblebees. It also adds nitrogen to the soil. It grows best in cool, moist conditions and can be a good ground cover.
- Leaves: Three leaflets, often with a white V
- Flowers: Round, pinkish-red heads
- Growth habit: Upright, 1-2 feet tall
- Benefit: Excellent nectar source for bees
Self-Heal
Self-heal has purple, tubular flowers arranged in a dense spike. It grows low and spreads by runners. It is a native plant that tolerates mowing well. It blooms from late spring to fall.
- Leaves: Oval, opposite, slightly toothed
- Flowers: Purple, two-lipped, in a spike
- Growth habit: Creeping, forms low patches
- Benefit: Attracts small bees and butterflies
Common Vetch
Common vetch has purple-pink flowers that look like small peas. It is a climbing vine that uses tendrils to attach to other plants. It fixes nitrogen and is often used as a cover crop. It can become weedy in gardens.
- Leaves: Compound, with many leaflets and tendrils
- Flowers: Purple-pink, pea-like
- Growth habit: Climbing or trailing
- Benefit: Good for soil health and pollinators
How To Identify Flowering Weeds In Maryland
Identifying weeds correctly is the first step to managing them. Here is a simple process you can follow.
- Look at the flower color and shape. Is it white, yellow, purple, or pink? How many petals does it have?
- Check the leaf shape and arrangement. Are the leaves opposite or alternate? Are they simple or compound?
- Note the growth habit. Does it grow upright, low and spreading, or climbing?
- Observe where it grows. Is it in full sun or shade? Wet or dry soil?
- Use a reliable field guide or app to confirm the species.
Take a photo if you are unsure. Many online resources and local extension offices can help you identify unknown weeds.
Control Methods For Flowering Weeds
There are several ways to manage flowering weeds. The best method depends on the weed species and your situation.
Manual Control
Hand pulling works well for weeds with shallow roots. Do it after rain when the soil is soft. For taprooted weeds like dandelions, use a weeding tool to get the whole root. Dispose of pulled weeds in the trash, not compost, to prevent seeds from spreading.
Cultural Control
Healthy lawns and gardens resist weeds better. Mow at the right height for your grass type. Water deeply but infrequently. Improve soil fertility and drainage. Mulch garden beds to block light from reaching weed seeds.
Chemical Control
Herbicides can be effective but should be used carefully. Pre-emergent herbicides prevent seeds from germinating. Post-emergent herbicides kill existing weeds. Always follow label instructions. Spot-treat rather than spraying whole areas.
Biological Control
Some invasive weeds have natural enemies. For example, leaf-feeding beetles are used to control purple loosestrife. This method is slow but can be very effective for large infestations.
Seasonal Guide To Flowering Weeds In Maryland
Different weeds bloom at different times. Knowing when to expect them helps you plan control efforts.
Spring
Early spring brings chickweed, bittercress, and dandelions. Garlic mustard also flowers in spring. This is a good time to pull annual weeds before they set seed.
Summer
Summer sees purslane, spotted spurge, and lambsquarters. Canada thistle and purple loosestrife bloom in mid to late summer. Focus on preventing seed production.
Fall
Fall is when ground ivy and white clover are active. Many perennial weeds store energy in their roots now. Herbicide applications in fall are often most effective.
Winter
Most flowering weeds are dormant in winter. But some, like chickweed, can grow during mild spells. Use this time to plan your spring weed management strategy.
Frequently Asked Questions
What are the most common flowering weeds in Maryland lawns?
The most common ones are chickweed, dandelion, white clover, and ground ivy. These thrive in typical lawn conditions and are easy to spot.
Are there any flowering weeds in Maryland that are edible?
Yes, several are edible. Purslane, dandelion greens, and lambsquarters are all safe to eat if harvested from areas not treated with chemicals. Always wash them thoroughly.
How can I prevent flowering weeds from taking over my garden?
Use mulch to block light, water at the base of plants, and pull weeds early. Keeping soil healthy and avoiding bare spots also helps prevent weed growth.
What is the best time to apply herbicide for flowering weeds?
Fall is generally the best time for perennial weeds because they are moving nutrients to their roots. Spring is good for annual weeds before they flower and set seed.
Are flowering weeds in Maryland harmful to pets?
Some can be. Spotted spurge sap can irritate skin, and garlic mustard may cause digestive upset if eaten in large amounts. Keep pets away from unknown plants.
Flowering weeds in Maryland are a part of the landscape, whether you love them or hate them. By learning to identify them, you can decide which ones to remove and which ones to leave for the bees. With a little effort, you can keep your lawn and garden looking the way you want.