How is zakat calculated for the trade of ornamental plant nurseries?

Zakat is obligatory on nurseries if they are cultivated and then sold. This applies to the proceeds from their sale if it reaches the nisab and a hawl (full lunar year) passes over it. The amount of zakat is a quarter of one-tenth (2.5%). However, if the nurseries are bought and then sold, they are considered trade goods and are appraised when a hawl passes over the original capital with which they were purchased. Zakat is then paid from their value at a rate of a quarter of one-tenth (2.5%) if it reaches the nisab.