Question:
Can I germinate the seeds from a grapefruit?Answer:
Seeds of grapefruit, oranges, lemons, and other citrus fruits can be germinated indoors. After removing the seeds from the fruits, plant the seeds in a pot containing potting soil. Plant the seeds about 1 inch deep. After planting, moisten the potting soil. Keep the potting soil moist until the seeds germinate. Germination may occur within two to three weeks or take as long as six to eight weeks. After the seedlings emerge, place the plants in a sunny window. Grapefruit, orange and lemon trees can be grown as houseplants for a few years. Eventually, however, they get too big for indoors and will need to be discarded. Plants grown from seeds seldom produce fruit indoors.
Learn more in these articles: Growing Citrus Indoors and Guide to Starting Seeds Indoors.