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Three main weed types are:
Adding a preemergent like Specticle to glyphosate may result in a lower cost of herbicides in the long run compared to using glyphosate alone.
Contact herbicides are more effective on perennial weeds.
Perennial weeds are easier to control than annual weeds with pre-emergents.
The lowest price herbicide per 1,000 square feet application is typically:
Glufosinate is similar to glyphosate, but requires higher coverage for good results.
Weed control in mixed plantings like around ornamentals is much easier than in a monoculture.
Cost is never an important factor when putting together a weed control program.