My peace lilly is or shall I say whats left of two peace lillies that I merged are slowly producing new leaves and It has a few of the old ones left.. I went to re-pot it and noticed that the roots are extremely long.. I mean long and theres millions of it.... It looks funny because whats on top of the soil doesn't look so big but below the soil is a monster! My plant isn't that big or full... Should I cut some of those roots. from what you see ofd the plant you shouldn't pot it in a large pot but if you see the roots you kinda have to... what do I do?
I would repot as is. They do get big when they get going. Its old roots that are no longer working will just act as food for the new growth as they decompose. http://www.houseofplants.co.uk/Spathiphyllum_wallisii_FL.htm