Not entirely. The very bottom strand is just poly rope. The first hot wire is about 4 in up. So you want to keep the area on either side of that fence clear of growth, about a foot on each side.So basically you got to keep the weeds along your fence almost down to a lawn level
There are a lot of products out there that inhibit growth for several months. But that doesn't take into account the creeping weeds that will crawl over the bare ground and start going up the fence. But I have found that treating the fence line three to four times a year is adequate. And it only takes maybe 30 minutes each time.