Japanese blueberry grows at a moderate rate. If you can get it planted this fall and provide adequate moisture and some supplemental fertilizing from spring to late summer it should reach that size in 2 or maybe 3 seasons. Any new plant is going to start slow as it gets established but then take off once it can get some roots out into the surrounding soil. The key is how fast can you get it established and can you provide water and fertilizer to promote faster growth.
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