Answer: It can work if you can give them all enough room! Make sure the young blueberry plants aren't shaded by the scraggly brambles, and give them at least 3' of space on each side (you may have to sacrifice one of your raspberry rows to make this possible). To acidify the soil you can replace half of the backfill from the planting holes with sphagnum peat moss. This simulates the acidic, boggy soil wild blueberries thrive in. Blueberries do need frequent watering, since their shallow roots don't search effectively for moisture. The easiest way to provide moisture is with a leaky hose or drip irrigation line. Enjoy your fruit salad garden!
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