But most planted grapes have both male and female flowers and they self pollinate, so this is rarely the reason for a lack of fruit. She writes a weekly garden Q&A and feature stories. If you’re able to provide screening – for instance by planting a hedge– the… Prune properly for the sun to reach the vine and to promote good air circulation. They typically get about 4 hours of sun and a lot of heat all day long. Grapevines can fruit for years if they are handled properly. If your grapes have been planted within the last three to four years they may not yet be capable of fruiting. The odds are that a wild grape from seed will be a male. No, you're not on acid. A native of Moultrie, Ga., she graduated from Queens University of Charlotte, formerly Queens College. Frost hitting after the vines have budded is another problem. It does not grow on new growth. Over-vigorous vines will not want to reproduce. A single grapevine can produce enough new growth every year to arch over a walk, roof an arbor, form a leafy wall, or provide an umbrella of shade over deck or terrace. Instead, grapes come from buds that grow on canes (last year’s growth). Grapevines can fruit for years if they are handled properly. Pollination. Grapes should be pruned pretty severely to be productive. She published a juvenile book about Zora Neale Hurston and attended West Virginia University and the New School. When the plant sprouts in the spring and grows a new shoot, that shoot turns … You can propagate bunch grapes from cuttings taken from year-old wood pruned during dormancy. Fruit trees require pollination to be able to set fruit. Answer + 2. Grape vines produce fruit on one-year-old wood, and that’s it – seriously. What to do when grape vines won't produce fruit. One is that you are treating the vine 'too well'. Buy a female plant for a companion. In contrast, most cultivated grape varieties are hermaphroditic, meaning that their flowers have both male and female parts – which is convenient because those vines will self-pollinate, producing fruit without a “mate” nearby. There is a small gap at the bottom of the bag for drainage which does not allow fruit fly to enter or in any way affect the bag's usefulness. If you don’t prune your vines, you won’t get much fruit. If I lightly touched the clusters they fell off. Bees are the main method for the transfer of pollen between flowers. Frost hitting after the vines have budded is another problem. The absence of bees might account for some drop in fruit production in your muscadines, squash and cucumbers. I have two, two year old table grape vines in the hottest part of my yard in the sunniest part of San Francisco. Bees and other pollinators are reluctant to go on the prowl for nectar when the weather is windy, rainy or cold. There are a few reasons grapevines don't fruit. Spread the food at the base of each grape vine, keeping it 6 inches to 1 foot from the trunk. I thought of transplanting them, but can they be transplanted? I wonder if it's because they can't get air circulation. Cut back on fertilizer and water until you can get some fruit to set. The prime suspect in most cases is a lack of pollination. If the vine is healthy and vigorous, the biggest factor that influences the size of the grapes is the number of fruits on the plant. If pruning has not been done correctly at any time, you might not see grapes until the problem is corrected. Because the fruit wasn’t allowed to mature, they were small and unnoticeable. It takes them a few seasons to develop mature wood and build up sufficient nutrients in the plant to produce fruit. The "Now Jazz Consortium" published her jazz educational fiction. These clusters all fell off before they got big. Writing professionally since 1980, she has penned promotional collateral for Music Magnet Media and various musicians. University of Wisconsin Extension Service: Growing Grapes in Wisconsin; Teryl R. Roper, Daniel L. Mahr et al. A hard frost late in spring can often kill the flowers or flower buds on grapevines and other fruiting and flowering plants.