The idea that plants have the ability to effect our mood, uplift our spirit and direct us towards healing is explained in the work of Dr. Edward Bach.
He created Flower Essences in the 1930's having stated there is healing properties on the dew found upon a flower. Dr. Bach believed not in struggling to improve upon a negative characteristic, but rather give attention to the opposite/positive aspect of that troubled habit.
In studying and sensing the subtle energetics of a particular flower we can effect our emotions and ultimately our health. Dr. Bach was a great leader in the work of plants as consciousness shifters. Studying, making and using flower essence is a lovely tool to have in ones chest.