This makes sure the fruit doesnt ripen too fast. Cooler climates produce more acidic grapefruits. Grapefruits are tropical fruits that originated insub-tropical weather, which makes them sensitive to the cold. Ripe fruit should also have a strong citrusy scent. They shouldnt be perfect. Red Grapefruit - Rice Diversity Orange, grapefruit and tangerine trees should be fertilized at least three times before July. Keep in mind that these are just general guidelines. Grapefruits should be firm and heavy for their size. As someone new to growing citrus, it does help to know that there are ways that you can increase your harvest while making sure that your plants are ready for another year of growth. Sampling a piece of fruit is usually the best way to find out if the others are ready to harvest. We know when to pick grapefruit, but not all of the fruit will be ripe at exactly the same moment. Fill in the form below and we will get back to you ASAP.You can also give us a call at (602) 956 3844. It should also be green with a thin white skin and a pink rind. hb``` V eaa+g ,pKv5nR,}:khZyChXL1"@ZeAL,BG&0bc;n.}. Last Update: October 15, 2022. Grapefruits have a ripening cycle that lasts between 6 and 8 months. You can also do this test with similar-sized grapefruits that are unripe or overripe. Grapefruit Grapefruit varieties can be divided into two natural categories: white or red. mydate = dateModified.slice(0,10); 2023 Gardening Know How, Future US LLC, Full 7th Floor, 130 West 42nd Street, New York, NY 10036.