Amdro Ant Block works best when dry. Ants don’t find the bait as appealing when it is wet, therefore you would want to keep the bait dry.
Amdro Ant Block Home Perimeter Ant Bait should not be applied to wet grounds or grass, if rain is expected within 24 hours, or when temperatures are below 50°F. Reapplication of product is recommended if it rains or if irrigation occurs after bait is applied