Question about SBK Brushwood

Hi

Since my post about getting rid of Virginia Creeper, I opted for the SBK Brushwood approach. I cut notches in the stem and tried to get as much of the Brushwood down the stem, but it was fiddly and some of the liquid ran straight onto the soil. Does this mean I should not plant anything in this area for a while? And how far away from this area of the soil is it safe to plant new plants?

Thanks in advance
Monica