Can I place a lien on my neighbor's property w/o a property line

[Fabian Martinez]

currently have an issue in Riverside, California i own a .43 acre that doesn't have boundary line nor buried markers, fence out of the question. property zoning is RR 1/2 county assessors plot map that all i have. prior purchase of the land seller stated next door parcel line begins 12 feet away from my barn. Remember and i quote it has no property line in-place, till-date have being maintaining neighbors parcel reason high percentile safety issue massive grass and brush including cactus near by my single family home and cabin wildfire ready to occur. furthermore Next door owner of the parcel his mother-in-law on April 12, 2019 sold property to me with the promise placing a fence and contracting a surveyor its being 4 month W/O action. fist should i justified question the matter? Can I site a lien or judgement, on the neighbor's property w/o a property line for neglecting and maintaining their property with out there consent? what is proper manner handle this particular matter? does any one in BP encounter similar case? quick disclaimer i am not asking legal advise only guidance.