Dallis Grass/Dallisgrass (Paspalum dilatatum)
This is a warm season perennial and found more predominately in humid areas of the southern United States. Outside of turf grasses, it can also be seen along roadsides and ditches, especially in sandy and clay soils.
This grass has coarsely textured yellowish-green leaf blades that grow 1/2 inch wide. If left unmowed, leaves can grow about 10 inches long. There is a white vein down the middle of the leaf with hairs and there is a purplish coloration at the base.
As the weed continues to grow multiple leaves produce a round clump that has a jagged, hard-edged appearance. It then spreads within clumps by rhizomes.
Stems shoot up from the
center which have long
seed heads on top.
These seed heads are
sometimes referred to as
a 'shaking rattlesnake tail'
and have 3 to 6 seed heads
on the top of one stem.
|Photo: Franz Xaver|
Seed heads average 4 inches but can be as long as one foot. They bow out at a 45 degree angle from stem, then arch and droop down. Each head consists of flat rows with oval seeds along it's entire length. They are pale green to a purplish color and are covered with black silky hairs.
Dallisgrass is hard to control and will grow to a height of 5 feet if left unmowed. It is competitive and can take over if conditions are right. It spreads through seeds and rhizomes and can be difficult to remove. For manual removal try digging out to get creeping stems. If hoeing, do this regularly and mulch.
Use an inorganic mulch like solarizing black plastic mulch for a number of weeks, place mulch on top and apply a preemergent in spring. Using a pre-emergent herbicide religiously when winter breaks to kill seeds before germination when soil temperatures warm, about 53 degrees.
Post-emergent's can be used in summer. Spray with MSMA or CAMA crabgrass herbicide at frequently and according to directions. Again, be cautious of using post-emergents, many are non-selective and can kill other vegetation and grasses.
Growing Plants from Seed
More suggestions for removing weed seeds.
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