Suspend SC will only kill the ants that contact a treated surface and would need to be applied every 30 days outside and 90 days inside. Termidor is the # 1 choice for ant control around the home. Termidor is a non-repellent insecticide that works with a delayed reaction amd also has a transfer effect. That means that ants cannot tell that the Termidor is there and will walk right over it and then pick the product up on their bodies and inadvertently carry it back to the colony, then through normal social interaction the ants spread the Termidor and wipe out the colony.
Termidor only needs to be applied two times per year and is effective for a wide variety of insects including ants, centipedes, roaches, spiders, silverfish, wasps and many other nuisance insects. You will need to apply Termidor SC 1-2 ft up the foundation and 1-2 ft out onto the ground, around door frames, window frames, places where cables, pipes or wires go through the wall and any other crack or crevice where the ants can gain entry into your home.
You cannot use Termidor inside for ant control so Suspend would be the better product if you needed to treat inside.
Unfortunately, Termidor is only labeled to be used up against the foundation of a structure and cannot be used in lawn applications. We recommend that you select a product that can be transferred back to the colony instead of a product that is effective only on the ants that touch treated surfaces. Ant baits are always a good choice and a granule product such as Maxforce Complete Granules would be an excellent option for ants in your lawn. You will broadcast it across your lawn in the places where you have seen activity or used inside of Bait Plate Stations. Maxforce Complete has a unique formula with a mixture of proteins, simple sugars, fats and complex carbohydrates in a food-based granular structure that is irresistible to insects.
For crabgrass control, you should be using a pre-emergent crabgrass killer such as Dimension 2EW Herbicide. This is going to be the best pre emergent product when controlling crabgrass, as it kills the crabgrass in the ground before it has a chance to grow above ground. The timing of the application of your pre-emergent is crucial to successful crabgrass control. In order to work properly, pre-emergent herbicides need to be in the soil before the crabgrass seeds start to germinate. Germination begins generally when the soil temperatures reach 55 degrees. This is around early spring, but the exact month will vary depending on where you live. Your local extension office can give you tips on when you should apply pre-emergents in your area.