It could be ants..................they love cornmeal....................if that does not work after the sun almost goes down mix 1 teasp non-alcohol liquid soap w 1 qt water and spray the flowers, leaves and the roots.................if that does not chase them use sevin..........read the label and make sure that your flower is on there........follow the directions carefully. Wear old long clothing, mask, hat, goggles and gloves. Don't spray on a day that it is going to rain or it is windy. Keep children & pets away until this is dry