I tried keeping geraniums indoors this winter but it just didn’t work. I didn’t have enough plant lights going and the geraniums just got too leggy. There’s nothing sadder than snapping off the yellowing geranium leaves until you just have a little tiny one at the top of the stem.
Of course, it’s much easier to winter over cold-sensitive tubers in the garage or cellar. Here’s the chapter from Your Plants on the subject:
CHAPTER VII.
WINTERING PLANTS IN CELLARS.
Many plants, such as Agaves (Century Plants), Oleanders, large Cactuses, etc., that have grown too large to be accommodated in the sitting-room or conservatory; can be successfully wintered in any moderately dry, frost-proof cellar.
After placing these large plants in the cellar, it will not be necessary to give them any water, the object being to keep them dormant all winter, which can be done by keeping the soil as dry as possible, but not so dry as to allow the plants to shrivel, or become withered. Large plants of the kinds mentioned, often form desirable ornaments during the summer time, but it is impracticable, in most cases, to bring them into the house in winter, but they can be kept for years by cellaring through the winter as stated. Large Geraniums, Salvia and Heliotrope roots, and even Tea Roses, and Carnations, can be kept moderately well in the cellar by trenching them in dry, or moderately moist sand. Thus many choice specimens of these plants that we are loth to pull up and threw away when winter approaches, can be successfully kept over until the next season. It is a needless expense to purchase a stock of new plants for the garden every year, when we can winter many of the old ones in this simple and inexpensive manner. The leaves of all deciduous plants should be removed before they are put away in this manner. The foliage should remain on the Oleanders and Carnations.