(1) Horticulture includes:
(a) propagation and cultivation of a * horticultural plant in any environment (whether natural or artificial); and
(b) propagation and cultivation of seeds, bulbs, spores and similar things; and
(c) propagation and cultivation of fungi.
(2) Use for commercial horticulture means use for the * purpose of producing assessable income in a * business of * horticulture.