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Herbicide Use

Once the weeds are established, they are very difficult to control. Post-emergent herbicides labeled for grassy weeds will need to be used. Most products will require several applications for complete control. Products with MSMA or DSMA will control crabgrass as well as other weedy grasses. The Ortho company makes a product with these active ingredients. Add the correct amount of a “sticker/spreader” to the herbicide mixture for better adherence and absorption into the plant.

There are usually three to seven spikes that can either be folded up like a funnel or spread out in a whorl pattern. Each plant can produce as much as 150,000 seeds a year. Crabgrass germinates from seed each year when soil temperatures reach 55 degrees for five consecutive days. The blooming of forsythia in your area closely coincides with the germination of crabgrass seeds.

Cultural Practices that Help Prevent Grassy Weeds

The preemergent herbicide label may list other broadleaf and grassy weeds that it controls. However, most are not very effective with broadleaf weed seeds.

Organic Preemergent

Nimblewill Grassy Weed
Nimblewill is a grassy weed that resembles bermudagrass. It is most prominent when growing in cool season grasses. Find information on identification, growth habits, and control methods.

Yellow and Green Foxtails (Summer Annual Weed)

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…

Summer grass is common in Australia’s lawns. It is a very fast-growing weed which sends out its shoots in all directions from its centre and spreads through stolons (above ground runners). Summer grass stems are either brown or red, with thin grey-green leaves and fine vertical seed heads that are spiky. A vigorous seeding plant, summer grass needs to be removed from lawns immediately. It’s like your lawn – lawn mowing has no impact on its control or growth, other…

Clover is noticeable by its ball-like flowers, which can often be partially yellow or beige colouring. It has trifoliate green leaves and rapidly growing green stems which grow quickly to spread the weed very efficiently, often becoming large weeds. As well as propagating new plants, it will take control of a lawn in no time if left untreated. Clover is a nuisance when it invades lawns, as it is very noticeable. Clover is difficult to control as it easily grows…

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…

Weeds are the unwanted plants that always seems to appear in our lawn when and where we don’t want them. Many weeds are acceptable grasses and are lawns themselves. While many of us are happy to just see green, addicts want their lawn consistent and pure with one or two species of grass. Read More

Poa is a grassy winter annual with perennial and biennial variations. Poa is light green in colour with a tufted or clustered growth habit and a white panicle (flower branch) inflorescence germinating from late winter throughout spring and summer, if conditions permit. Leaf blades are folded along its vein with a “long boat” shaped leaf tips that curl up at the ends. Poa is a very adaptive weed that can thrive in shaded areas and full sun depending on moisture…