Both my neighbor and mine had erected a fence along our property.
They had a vinyl fence, and since code specified a fence cannot be directly built on the property line but must be set 6" back minimum, their fence was about 8" back. I hated the look of a vinyl fence so I built a wood fence, also about 8" from the property line.
This leaves a sliver of space about 16" wide between our two fences.
Mysteriously things started to grow inside this sliver, shrubs, and a few papaya trees shot up and now is about 9' tall with the trunk diameter 3" in size. Some of the shrubs are starting to shoot up to already taller than the 6' fence, some things are bulging against my wood fence, nothing serious yet but if I ignore them it will be serious in a few years.
Obviously we don't have access from the side, but only from the top. The area is about 110' long.
Is there something I can sprinkle down this space and kill off what's in between? I cannot use RoundUp because my understanding is RoundUp you need to spray to the root area and I only have access from the top side.
Thanks,
MC