Answer: Let's see if we can clear up the confusion. Blueberries do not absolutely require two different cultivars for cross pollination purposes. However, bigger berries and higher yield will result from cross pollination, and thus it is desirable to plant at least two different cultivars. Blueberry bushes have very shallow root systems and are very sensitive to water fluctuations, so planting beneath them can create too much competition for moisture and nutrients. You can overcome this with additional water and fertilizer. I think the important thing to remember is that the roots are shallow and could be damaged if you regularly cultivated beneath them. To be on the safe side, I would not plant anything beneath them and I would mulch over the soil surface with peat moss, both to help moderate soil temperatures and to aid in moisture retention. As the peat degrades, it will help acidify the soil.
Hope this information sheds some light on the subject!
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