Planting shrubs after pre-emergent herbicide
We spread dimension (dithiopyr 0.0103% with 19-0-0 fertilizer) granular herbicide on our lawn last week at a rate of 5 lbs per 1000 sq ft.
Now we would like to plant common lilacs (24-36" tall) and emerald green arborvitae (48" or more tall).
Is it safe to plant or do we need to wait 4 months for the herbicide to break down?
We had planned to till in compost to amend the soil, but could that make it even worse by mixing in the herbicide?