grow ginger in a container:  Growing ginger indoors is easy and low-maintenance — just buy three fresh ginger roots from the grocery store and plant them in a container that&#39;s about 14-inches wide by 12-inches deep. Only move the roots outside when the weather reaches about 50 degrees.    Ginger takes about 10 months to reach maturity — you&#39;ll know when the plants reach two to four feet tall.