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Its thick growth habit will crowd out any desired vegetation and, in the eastern United States, it is considered one of the worst invasive exotic plant species. Its roots can grow up to 10 feet deep and over 20 feet wide. These dimensions, along with its resiliency in the face of cutting it back, make this invasive perennial weed very difficult to remove from your lawn or garden completely.

The root system and hearty growth of Japanese knotweed can damage your home’s concrete foundations, driveways, walkways, and retaining walls.

White clover is a common lawn weed that grows prodigiously and very aggressively. Coupled with the fact that the weed employs nitrogen fixation, it is very opportunistic and grows on soils with poor fertility. Having a smaller amount of these common weeds in your lawn isn’t necessarily bad because it is a natural fertilizer. In fact, if 5% of your lawn is made up of clover, the entire lawn receives an adequate supply of nitrogen.

Weed Identification

The velvetleaf is an annual summer plant that can grow up to 8 feet tall on stout stems that are covered in soft, velvety hairs. The plant will form large heart-shaped leaves that grow at different points on the stem. Each leaf has long, stout stalks that support its weight. When the leaves of the velvetleaf are crushed, they emit a very distinct smell.

The best practice for dealing with selfheal is, as always, proper lawn care practices and preventative maintenance. Effective and proper lawn mowing practices should suffice to prevent these perennial weeds from developing seeds.

Gardeners should deal with this annual weed while it is young. Once it has spread its seed, it can become challenging to control. This weed is best controlled by pulling it from the earth. An herbicidal application may not be necessary.

That’s what this article is all about. We’re going to look at common weeds with white, yellow, pink, purple, and blue flowers. You’ll not only have a visual representation of each weed to guide you, but included in each weed identification will be the physical description of each of these pesky invaders. You’ll also learn about the problems they can cause in your lawn along with how you can control and eliminate them from your yard.

Capeweed is an annual cool season broadleaf weed, low to the ground with light green leaves and distinctive large serrated outline, while the underside of the leaves is usually a textured, silvery-white colour. Germination usually commences in mid to late autumn, and the lifecycle continues until late spring or early summer when it sends out its single yellow flower with a black middle, before going to seed. The continuing lifecycle of capeweed can be controlled by regular mowing and prevention…

The Oxalis family of weed is one of the largest broadleaf weed families. Common varieties encountered are Soursob, Purple Oxalis, Wood Sorrel, Creeping Oxalis, and many more names. With more than 30 varieties in Australia, not all are weeds many are ornamental plants. Oxalis is often mistaken for clover. However, while they both can have a similar appearance with trifoliate sectioned leaves, oxalis is easily distinguishable by having heart-shaped leaves compared to the oval-shaped leaves of clover. Like clover, oxalis…

Pearlwort is a dense, low-growing broadleaf weed with smooth, slender stems rooting at the nodes. Oppositely arranged, thin, grassy like leaves up to 14 mm long branch out from the stem at close intervals, not broadleaf in appearance. These heavily branched stems form a mat-like growth habit that forms thick ground cover. Small, inconspicuous flowers appear in spring, summer and autumn, with green sepals and tiny white petals. Flowers remain closed in buds and are visible only briefly as they…

Capeweed (Arctotheca Calendula)

Onion Grass is a perennial grassy weed with between three and 10 thin, strappy leaves rising from the central base up to 30 cm long. The leaves are up to 2 mm wide with a prominent central midrib that protrudes to create an almost cylindrical leaf blade in cross section in a spear and quite a tough point. Flowering in spring, the onion grass plant produces two to four small flowers per plant that are positioned around the base of…

Mullumbimby couch is a perennial grass-like sedge up to 15 cm high with dark green, glossy, strap-like leaves. It has tough, long rhizomes that are red to purple in colour and triangular stems in cross-section which is characteristic of sedges. This sedge is in mostly observed in flower through spring and summer and presents as a single round, compact spike with three short, curved leaves protruding from the base of the seed head. Mullumbimby couch grows best in areas of…

Ryegrass is a cool season perennial or annual grass with tufted or clustered growth and perennial strains have a glossy dark green leaves while annual strains can be brighter green which both are often purplish at the base. Ryegrass possesses a thin ligule with a folded leaf along its vein and overlapping or clasping auricles. The seed heads appear in spring and early summer as a long, narrow spike with a long cluster of small dark seeds at the top.…

Chickweed is a common weed. With many varieties, ‘Common Chickweed’ is the most encountered. A small plant with shiny leaves with multiple stems, Chickweed produces a single white flower on each stem. Its invasiveness into healthy lawns is rare and it doesn’t like to compete. Chickweed prefers to germinate and grow barer patches of turf. Chickweed cannot recover from the loss of its foliage, so regular mowing of lawns ensure its eradication – which is another reason chickweed is rarely…

Control: Mulch garden areas in spring to prevent weeds. Pull oxalis weeds by hand or spray weeds with a postemergence herbicide in spring or fall.

Where It Grows: Sunny or shady landscape, lawn, or garden areas

Type: Broadleaf perennial

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Where It Grows: Lawns and gardens in sun or shade

Size: 12 inches tall, 6 – 16 inches wide

Appearance: This common lawn weed has a strong taproot; leaves are deeply notched. Yellow flowers mature to puffballs. Dandelion seeds are like parachutes that fly away in the wind—they’re the plants that you would blow on and “make a wish” when you were younger.

Appearance: This garden weed has light green leaves that look like clover and cup-shape yellow flowers in summer and fall.