Mulching: cover ground to prevent growth of weeds and therefore facilitate life of ornamental plants.
Draining: passage of water through the felt avoids surface flow, preventing landslides and erosion of the ground.
Insulation: When used in vineyards prevents temperature fluctuations for example due to thermal excursion between night and day which harms the vines.
Maintenance: very little need of weed removal.
Mechanics: allows passage of work vehicles (small tractors) operating between the rows without 'ruining' the ground.