How do you over-winter geraniums as bare-root plants?
Carefully dig up the geraniums before the first fall frost. Shake the soil from the plant’s roots. Then place one or two plants in a large paper sack and store in a cool (45 to 55 degree Fahrenheit), dry location. An unheated bedroom or indoor porch might be a suitable location. An alternate (somewhat messier) method is to hang the plants upside down in cool, dry location. The foliage and the shoot tips will eventually die. In March, prune or cut back each plant. Remove all shriveled, dead material. Prune back to firm, green, live stem tissue. After pruning, pot up the plants and water thoroughly. Place the potted geraniums in a sunny window or under artificial lighting. Geraniums that are pruned and potted in March should develop into attractive plants that can be planted outdoors in May.