Hostas can grow to be very large, lush plants. However, if your hostas are not thriving due to lack of or too much sunlight, or if you just want to move them, hostas are hardy plants that can be transplanted and still thrive. In fact, transplanting is a good time to divide large hostas, which is a common propagation practice with gardeners. The best time to transplant hostas in early spring, just when they begin to grow.
Prepare the new planting bed so you can transplant your hostas soon after you dig them up. Till the soil 12 to 16 inches deep and mix in 6 inches of organic matter (e.g. compost, leaf mold). Most hosta varieties prefer shade, with some morning sun.
Dig up the hostas. Dig about 16 inches deep to be sure you get most of the root systems, especially for large hostas. Dig a circle around each plant 2 inches larger than the plant's width. Lift up on the handle in several places to lift it out of the soil.
Divide the plants, if desired. Take a garden fork and stab it in the middle of the plant's roots to cut it in half. You can also divide it into several smaller plants. Wash off the roots so you can see them better and use a knife to divide the plant. Each section should have several fleshy eyes, which are located at the top of the roots.
Replant your hostas the same depth as they were planted before. Tamp down the soil so there are no air pockets and then water the plants well. Mulch around the hostas to help retain moisture. Water your hostas every week if there was less than 1 inch of rainfall that week.