I haven't gardened there, but here's what I've found that may be of some help to you.
When I googled plants that grow well in that region, I found the following: sorghum, castor beans, coffee, cotton, okra, black-eyed peas, watermelon, gourd, pearl millet, teff, enset, African rice, yams, kola nuts, oil palm, and raffia palm. I'm sure there's more.
I have the "Sunset Western Garden Book of Edibles" book. You may want to check this book out at the library (not sure if African libraries would have it, not sure if you're there or somewhere else in the world right now). Anyway, the book defines every region based on weather patterns, which will help you narrow down the climate zones and it also has a few suggestions (but not all) on what edibles grow best in each climate zone. Once you find the climate zone, you can probably google what plants grow best in each zone, since the subsaharan region is vast and has several different climate zones. If the book doesn't work out, you could always google "climate zones of the world."
Hope this helps, good luck and god bless!
Edited by: LAURA_LYNN at: 8/1/2012 (14:24)
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