Types
Note: Seedless varieties will produce smaller grapes.
- ‘Edelweiss’: Hardy in zones 4–7 (–20°F), early white variety. Table and wine.
- ‘Reliance’: Hardy in zones 4–8, seedless, pink table grape.
- ‘Seibel’: Hybrid, wine grape. Cold hardy.
- ‘Swenson Red’: Hardy in zones 4–8, red table grape.
- ‘Magnolia’: White Muscadine wine grape. Sweet. Best in zones 7–9.
- ‘Valiant’: Eating grape hardy to Zone 2.
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If the yellowing is sporadic and nonuniform, then it may be an iron or magnesium deficiency. However, there are many reasons for vine leaves to yellow. If plants begin to fail, have your soil tested for nutrient deficiencies by your area cooperative extension (find it here: http://www.almanac.com/content/cooperative-extension-services). Fertilizer is good if it contains what the plant needs; soil quality is paramount.
We hope this helps.
In mature grape vines, it's normal for the outer layer of bark to sometimes crack or peel off, which is a sign that the vine is growing and "bursting at the seams," so to speak. Another cause of bark-peeling is frost damage, but because the problem is occurring now, mid-summer, this seems unlikely. A third possibility could be that your vine is getting too much moisture. Does your vine have a lot of mulch or soil around it's base? If so, try pushing it back from the stem to allow the base to get more air and less moisture.
It would be best to wait to prune until late spring (March or April). At that time, vines will still be mostly dormant, but you will be able to tell which canes are alive from emerging leaf buds. Just let them grow and gather energy this year, then prune in the spring and hope for grapes in the summer!
We are based in North America, so we can't be sure about gardening outside of our region. However, Uganda seems to have relatively even temperatures throughout the year, which means grapes shouldn't have trouble growing there. Try to find a local gardener to ask about the best varieties for your area.
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