Rhubarb is a hardy plant that grows well in the St. Paul, Minnesota area. The soil is rich and fertile and the rhubarb plant requires good soil for growth. Weeds also grow well in the area and if they are not tended to they can crowd out rhubarb and eventually kill it. Always keep your plants weeded to prevent overgrowth of weeds.
The plants do not need to be overed to protect them from the cold since it is a hardy plant it can freeze out the the roots will not be harmed. The plant grows from the roots and the roots will not freeze. If you have concerns you can cover the roots with a weed free hay or some organic leaves to protect them.
Fertilize your rhubarb in the fall with organic compost or manure. Work up the soil with a hoe around your plant and spread a thin layer of the compost or manure on top of the worked up soil. Then let winter take over and by the time spring comes the organic fertilizer with work into the soil and nurish the plant. Be careful if you use manure that it does not touch the rhubarb plant.
In spring rhubarb with push through the soil and produce large tasty stalks and leaves. If your plants are large and tender you probably do not need to feed them since they do not need to be fed every year. You can over fertilize rhubarb and then it can grow too fast and get too big to eat.
The rhubarb plant can be toxic so never plant it near a water source and that includes above a well or spring. It is best to plant it in open spaces in an area by itself since many plants do not do well growing by a rhubarb plant. If you have more then one rhubarb plant then plant them together since they do like each others company.