In botanical parlance, a clone is a subdivision of a grape varietal. Just as grape varieties differ from each other, vines of the same varietal can have, for better or worse, individual characteristics. For example, one clone of Chardonnay may ripen faster than another clone of Chardonnay grown in identical conditions, while others may be more disease resistant or produce higher yields. Grape growers asexually reproduce the vines exhibiting the best genetic qualities by taking cuttings from the mother plant and grafting them to a phylloxera-resistant rootstock (this is usually done at a vine nursery). This process gives growers the ability to plant genetically identical clones best suited for their specific vineyards.