This liquid Vitamin B1_Plus has proven to help stabilize and strengthen the root system at transplanting time. We also use it as a tonic in the fall and again in early spring. Quote Sky: "It works similar to Gatorade in humans. Vitamin B1 replaces needed nutrients after stress of winter, hot summers, travel or transplanting shock." Photo shows one gallon. We offer ! quart- shipped with plant order no additional shipping cost.