I hunt in a sunken duck pit in Arkansas. We have a levy that runs through the flooded rice field. The blind(or pit) is in a hole that was dug during the spring and it sits flush with the levy. The levy has some grass growing on it. We cut some wild cain from Alabama and brought it to conceal the pit. It works great for my set up. Maybe this helps some.

the more natural stuff you use that's indigenous to the area the better.

Most critical thing is to match the local area. Too many people make the mistake of applying the wrong camo pattern or material and it sticks out. Like the guys above said, the best way to blend in is use stuff from nearby.