(a) All nursery stock must be kept and displayed under conditions of temperature, light, and moisture sufficient to maintain the viability and vigor of the nursery stock.
(b) Packaged dormant nursery stock must be stored under conditions that retard growth, prevent etiolated growth, and protect its viability.
(c) Balled and burlapped nursery stock being held for sale to the public must be kept in a moisture-holding material approved by the commissioner and not toxic to plants. The moisture-holding material must adequately cover and protect the ball of earth and must be kept moist at all times. The commissioner may approve alternative nursery stock management practices to maintain the viability of balled and burlapped stock.