Once Termidor SC is applied it can take up to a month or 6 weeks depending on ant species and size of the colony. As long as you are seeing dead ants the product is working. Should you start to see live ants again then there may possibly be a satellite colony in a wall void that needs to be spot treated or baited.
Please see our How To Get Rid if Ants Guide as well for more tips.
Termidor SC is best applied in the trench as this is the most continuous application method. There are places all over the BASF Termidor product label, which clearly state that rodding alone is not sufficient, no matter what applicator tool used, to treat a home for termites. You can either do a 6x6 trench around the foundation, or a 6x6 trench with rodding used additionally every 12 inches through the trench at a depth not to exceed the footing of the home. If you just cannot trench the area you may also consider the bait stations as an alternative. You can also refer to our How To Do A Termite Treatment article for treating your home yourself.
Termidor SC can kill sugar ants when used outside around the perimeter of the home but these are not actually a species of ant. It is just what ants that are looking for a sugar/carb based food are called since they go for sweets. We would suggest using either the Indoor or Outdoor Ant kit depending on where you are seeing activity.
Sugar Ant Products/Kits
How to Get Rid of Ants Treatment Guide
Termidor SC should have no effect on plants that are inadvertently sprayed with the product. It is important to read and follow the Termidor SC product label which states that you can only treat one foot up from and one foot out from where the ground meets the structure. The label also recommends that you remove or prune away plants, shrubs or tree branches that touch the structure. Vegetation that comes into contact with the structure may offer a route of entry for the ants allowing them to enter the structure without ever having come into contact with the treated area.