How2Day: The Soil Requirements for a Japanese Blueberry Tree

The Japanese blueberry tree (Elaeocarpus decipiens) grows slowly, eventually maturing 40 to 60 feet tall and 20 to 40 feet wide. Not an edible fruit tree, it produces white, urn-shaped flowers that smell sweet and become pale blue once pollinated. Later, olive-like fruits developed, becoming dark blue-black. Plant Japanese blueberry tree in partial- to full-sun exposure, 6 to 12 hours of sun daily. The plant's leaves are evergreen, but oldest leaves turn orange to red before dropping. This broadleaf plant grows outdoors in U.S. Department of Agriculture hardiness zones 8b and warmer.

Avoid heavy or compacted soils when choosing a garden spot for a Japanese blueberry tree. A porous loam or sandy soil is best according to the American Horticultural Society's "A-Z Encyclopedia of Garden plants." A soil rich in organic matter promotes best root health and tree growth, especially important in sandy soil types.

Michael A. Arnold writes for Texas A&M University that Japanese blueberry tree tolerates slightly higher pH soils that plants like rhododendrons. However, if soil is too alkaline, leaf yellowing occurs. The "A-Z Encyclopedia of Garden Plants" recommends soils that are acidic to neutral, definitely not too alkaline (pH above 8.0).

Japanese blueberry trees must grow in a soil with good drainage, but still retain water to keep the tree's roots evenly moist, especially from spring to autumn. Adding organic matter and top-dressing mulch allows sandy soils to better retain moisture. In the cooler months of winter, this plant needs less water, but roots shouldn't become encased in overly dry soil conditions. Don't plant Japanese blueberry tree where the soil readily forms puddles after rains or irrigation.

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