Horticultural land (Effective for taxes imposed for taxable years beginning on or after July 1, 2005). Land that is a part of a horticultural unit actively engaged in the commercial production or growing of fruits or vegetables or nursery or floral products under a sound management program. Horticultural land includes woodland and wasteland that is a part of the horticultural unit, but the woodland and wasteland included in the unit must be appraised under the use‑value schedules as woodland or wasteland. A horticultural unit may consist of more than one tract of horticultural land, but at least one of the tracts must meet the requirements in G.S. 105‑277.3(a)(2), and each tract must be under a sound management program. If the horticultural land includes less than 20 acres of woodland, then the woodland portion is not required to be under a sound management program. Also, woodland is not required to be under a sound management program if it is determined that the highest and best use of the woodland is to diminish wind erosion of adjacent horticultural land or protect water quality of adjacent horticultural land. Land used to grow horticultural and agricultural crops on a rotating basis or where the horticultural crop is set out or planted and harvested within one growing season, may be treated as agricultural land as described in subdivision (1) of this section when there is determined to be no significant difference in the cash rental rates for the land.