"Here, where the world is quiet;
Here, where all trouble seems
Dead winds' and spent waves' riot
In doubtful dreams of dreams;
I watch the green field growing
For reaping folk and sowing,
For harvest-time and mowing,
A sleepy world of streams."
– Algernon Charles Swinburne, The Garden of Proserpine
Horticulture is the formal study of plant growing. Having mastered both the science of botany and the art of of gardening allows a Pilgrim to undertake the more proper ways of caring for plant life. With an increased knowledge of care given to the harvest process. Horticulture decreases the time it takes for a potted plant to reach maturity.
As of the "Witch Tool for the Job" update (31-10-2014) Horticulture only decreases the time it takes for plants to mature.