What will kill ferns?

Immediately after cutting it, apply herbicide to the cut section of the stems using a squirt bottle or a paintbrush. For the best results, the herbicide should have a concentration of 8 percent triclopyr. The plant will absorb the herbicide through its cut stems, which will then kill the underground roots. If you need more information you can Call Now: +1 855 640 0327 (Toll-Free) this number.