African Blue has 10x the concentration of essential oils compared to Italian. You can use it for pesto, but because such a small amount is needed (Tbsp leaves per quart pasta) you'll want to add other greens if you want a green colored outcome.
I highly recommend Greek Columnar Basil to everyone. It is hardier than Italian and Thai cultivars, a smaller leaf size than Italian, a slightly stronger flavor with a hint of black pepper flavor. In areas of intense summer heat (e.g., 100+) it will need shade from noon on. It is perennial in zone 10 and above. Original species is from Kenyan highlands.
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Richard
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