under crown of old oak in front of the perennial bed, several

crown old oak front perennial bed circular holes drilled lawn soil aeration drainage hole filled gravel substrate roots breath aerated aeration aerification air analysis architecture black breathing buried circle circles cobblestone drill drilling environment fence garden gardening grass gravel green grid hole holes humidity landscape layer metal mulch oak outdoor park pedometer probes quality quercus robur roots sample samples scarification sidewalk soil street substrate technology topsoil tree trunk turf