If you are refreshing the soil in your money tree’s pot after some years of use, you may find you can stick to the original pot. Provided there’s enough room for growth, there’s no need to size up. But if you get your money tree free and find a mass of tangled roots with very little soil, it’s time to size up! Best practice is no more that two inches larger across than the previous pot. This gives room to move, but prevents the pot developing unoccupied real estate at the edges of the container. Large volumes of soil without roots tend to become stagnant in time, holding stale water and playing host to fungi and other microbes of the nastier sort.