I tested the effects Dimension 23-0-8 with .13 percent Dimension (dithiopyr) on newly sprouted grass. I used newly sprouted grass left over from seed soaking tests. I used two pots of Scotts "High Traffic" seed (left). and two pots of Scotts "Classic" seed (right). I added 4 particles or 8 particles of the fertilizer/crabgrass control blend. This corresponds to an estimated 4 or 8 pounds of the fertilizer crab product per 1000 sqft. Grass was planted inside on March 17. Fert/crabgrass product added March 31, Photo taken April 14, 2012. It appears that the crabgrass treatment did not harm the new grass, even though it was only about 2 inches tall at the time of treatment.