While you should divide/transplant rhubarb plants every 4 or 5 years, it is best to return your plants or divisions to ground conditions as soon as possible.
Since that is not possible, you can replant them in a large container and place them in a cool, dark area such as a garage or basement if it will give the plants the necessary environment for winter dormancy. Pay attention to the plant during the winter months to monitor its condition. You will want to replant them in the spring as soon as the soil in workable.
While you should divide/transplant rhubarb plants every 4 or 5 years, it is best to return your plants or divisions to ground conditions as soon as possible.
Since that is not possible, you can replant them in a large container and place them in a cool, dark area such as a garage or basement if it will give the plants the necessary environment for winter dormancy. Pay attention to the plant during the winter months to monitor its condition. You will want to replant them in the spring as soon as the soil in workable.