The average condition of the weather in a grow room or outdoors.
A poisonous alkaloid from the autumn crocus, used in plant breeding to induce polypoid mutations.
For cannabis plants, air temperatures below 50 F (10 C).
An unheated outdoor structure usually clad in glass or clear plastic used to protect and acclimatize cannabis seedlings and plants.
The band of colors (measured in Nm) emitted by a light source.
A coloring agent that is added to many commercial fertilizers so the horticulturist knows there is fertilizer in the solution.