Geraniums, chrysanthemums, and many other outdoor-type plants can be purchased in the nursery at this time of year in pots, grown indoors until spring and then planted outside. If so, potted herbs may be more appreciated than other types of plants for windowsill gardening. In the spring, the herbs may be planted outside. Chives, bunching onions, oregano, thyme, and rosemary are some of the herbs you can find in the nursery for giving as gifts. With all of these ideas, be sure you understand why your friends don't grow plants indoors.
Some people are allergic to certain plants or the fungi in the potting soil.
Some do not want to be tied-down to their indoor plants in the winter. They may prefer to travel to see friends and family. Indoor plants can inhibit travel plans. Some gardeners just want a break from gardening so that in the spring they are rejuvenated and anxious to return to the garden. Some have just never tried to grow plants indoors or think it is too difficult for them.