Fall is also a great time to do a flower bed pre emergent application. You should be doing two to three flower bed pre emergent applications per year depending on the product you use.
A few things to remember about flower bed pre emergents:
1. Always use a granular. For turf we always recommend a liquid, but for flower you need to stick with a granular. Spraying a liquid herbicide all over the shrubs, plants and flowers in your beds is NOT a good idea. A granular is going to roll off the foliage of your plants and make its way down to the soil where you want it.
2. Avoid areas that have seasonal color or where you plan to add seasonal color. Pre emergents can inhibit healthy growth and will eventually kill off seasonal color. So be very conscious and careful of where you are applying your pre emergent.
3. Don’t expect 100% weed free flower beds. About a 70% reduction in weeds is what you can expect from a flower be pre emergent, so there will still be some hand weeding required. But for anyone that has ever pulled weeds…the less the better!