Whether it’s piston driven coring with the John Deere Aercore or deep-tine vertidrain with the Wiedenmann, we offer aeration services that can be done all months of the growing season. The coring should be done twice a year when the soil is moist and not thoroughly saturated. The deep-tine can be done in-season due to the fact that it does not disrupt the playing surface. The deep solid tines range from 4 to 12 inches in length. The hollow core tines are 4 inches long and up to ¾ inch wide.