I have cleaned out the debris from the gap and blasted it with water to remove all the loose little things.
Now, I have bought a sealant and want to apply it.
The problem that I'm seeing is that the floor of the gap is not even. Sometimes it's like 1.5 inches deep (where there were plants that I pulled out) and sometimes it's 1/2 inch deep:
How do I make it more even? Do I use a backer rod? If so, do I lay a continuous backer rod everywhere or only in the places where the gap is deep and leave the naked soil where it's shallow?
Can I apply the sealant on the soil directly (where it's shallow)?
Thanks kindly for you help. Jenia