Glyphosate: A non-selective herbicide, such as glyphosate, can be used for spot treatments around ornamental plants, but should be used with caution. Do not allow glyphosate spray mist to contact ornamental foliage or stems as severe injury will occur. A cardboard shield may be used to prevent glyphosate spray from drifting to nearby ornamentals. For examples of glyphosate products in homeowner sizes, please see the list above in the “Control in Lawns” section.
Metsulfuron can be used on bermudagrass, St. Augustinegrass, centipedegrass, and zoysiagrass. The Quali-Pro Fahrenheit also contains Dicamba for Broadleaf Weed Control. Blindside Herbicide also Contains Sulfentrazone for Nutsedge Control.
Sethoxydim: Sethoxydim is a selective herbicide that can be applied safely in landscape beds containing most landscape plants, but check the product label for a listing of tolerant plant materials. Sethoxydim will only control grass weeds; however, do not allow sethoxydim to contact ornamental grasses. A 2.5% solution should be applied before bahiagrass reaches 4 inches tall. Read label directions for mixing. Examples of products containing sethoxydim in homeowner sizes are:
In landscape beds bahiagrass can be hand dug or controlled with an herbicide. As mentioned previously, it is best to prevent the invasion of bahiagrass by maintaining ideal growing conditions and using a 3-inch mulch layer to block weed development. Bahiagrass is a perennial weed that can emerge from both seeds and rhizomes. Once bahiagrass has made its way into the landscape bed an herbicide may be necessary if hand pulling is not practical.
Once bahiagrass weeds have been eliminated in areas of the turf, bare spots will be left behind. To prevent the invasion of new weeds in these bare spots, it is best to fill them with plugs or sprigs of the desired turfgrass.
Sethoxydim: Some products containing sethoxydim may be applied within the vegetable garden after planting. These will control most grass weeds, in addition to bahiagrass. However, do not apply near sweet corn. Examples of products labeled for use within vegetable gardens are:
Imazaquin: Image Kills Nutsedge is a homeowner-packaged, post-emergence herbicide product that will aid in the control of and reduce competition from bahiagrass. It may be applied to established bermudagrass, Zoysiagrass, centipedegrass and St, Augustinegrass, but do not apply to tall fescue. Do not apply imazaquin to St. Augustinegrass for other weed control during the winter. Do not apply imazaquin just prior to or during spring transition (green-up of the lawn). Do not use imazaquin in vegetable gardens and do not use the grass clippings from treated lawns as mulch in landscape beds or around vegetables, fruit trees, or small fruit plants.
he flowering stems (i.e. culms) are sometimes branched near the base and their joints (i.e. nodes) are usually hairless (i.e. glabrous). The leaves consist of a leaf sheath, which partially encloses the stem, and a spreading leaf blade. The leaf sheaths are hairless (i.e. glabrous), although sometimes the sheaths of lower leaves have a few long hairs (i.e. they are sparsely pilose). The leaf blades (6-45 cm long and 3-12 mm wide) are slightly folded at the base and are usually hairless (i.e. glabrous) with rough (i.e. scabrous) margins.
A long-lived (i.e. perennial) grass usually growing up to 1 m tall, but occasionally reaching up to 1.5 m in height. It forms large clumps via short creeping underground stems (i.e. rhizomes).
The seed-heads are up to 25 cm long and have 2-11 branches (i.e. racemes) that are alternatively arranged along a main stalk. The branches (2.5-11 cm long) contain numerous flower spikelets that are borne in pairs, and appear to be arranged in four rows. These flower spikelets are covered with hairs and consist of a pair of bracts (i.e. glumes) and two tiny flowers (i.e. florets), only one of which produces a seed. Flowering occurs mainly during spring and summer. The seeds (i.e. caryopses or grains) are oval (i.e. elliptic) in shape and 3-4 mm long. They are shed still contained within the remains of the flower spikelets.
Paspalum (Paspalum dilatatum) is regarded as an environmental weed in Queensland, New South Wales, Victoria, Western Australia and South Australia.
A long-lived tufted grass growing up to 1.5 m tall. Its leaf blades are slightly folded at the base and are usually hairless. Its seed-heads are borne at the tips of the upright flowering stems these seed-heads have 2-11 branches (2.5-11 cm long) that are alternatively arranged along a main stalk each seed-head branch bears numerous small flower spikelets that are covered with hairs.
A very common weed of gardens, lawns, footpaths, parks, roadsides, disturbed sites, waste areas, closed forests, open woodlands, crops and pastures in tropical, sub-tropical and temperate regions.
A very widespread introduced species that is mostly found in the southern and eastern parts of Australia. It is common in eastern Queensland, eastern New South Wales, the ACT, Victoria, Tasmania, south-eastern South Australia and south-western Western Australia. Less common or occasionally naturalised in the southern and north-western parts of the Northern Territory, and in the inland parts of Queensland, New South Wales and South Australia. Also naturalised on Lord Howe Island and Norfolk Island. Widely naturalised in other parts of the world, including southern Europe, tropical and southern Africa, Asia, the Mascarenes (i.e. Mauritius, La Reunion and Rodrigues), New Zealand, the USA and many Pacific islands (i.e. Hawaii, American Samoa, Fiji, New Caledonia, Niue and the Solomon Islands).