What kind of soil is needed to grow thunbergi, Japanese, and meutoriensia barberry bushes? What ph is required? How many hours of sunlight do they require each day? If pruned, will they grow upright in a column instead of round like a globe?
Japanese barberries (Berberis thunbergii) are invasive in Maryland and we do not recommend planting them. In addition to their invasiveness, they have been found to be associated with higher populations of black-legged ticks. You can find more information about this plant on our website. https://extension.umd.edu/hgic/topics/japanese-barberry
Berberis x mentorensis is very tolerant of a wide variety of soil types and pH, but the soil needs to be well-draining. They prefer full sun to part shade. When left unpruned, their natural tendency is to form a mounded shape, but they can be pruned and sheared to form a hedge. That is how they are most often used. Here is additional information about this plant. https://hvp.osu.edu/pocketgardener/source/description/be_ensis.html