Why red sphagnum peat is essential for blueberry growth

Blueberries have an exceptionally narrow comfort zone. Unlike many garden shrubs, they do not adapt to the environment; instead, they require the environment to be specifically tailored to them. If the soil chemistry is wrong, pruning and fertilizers act only as life support, not as a means to produce a harvest. The primary constraint is soil acidity, specifically a pH between 4.0 and 5.5. In standard garden soil, blueberries cannot absorb essential micronutrients even if they are present, leading to chlorosis and stunted growth. To resolve this, growers create a substrate "buffer" using red sphagnum peat. Simply adding compost or organic matter to alkaline soil is ineffective; the plant requires a systemic acidifying medium that persists throughout its lifecycle. When selecting a variety, the decision must be based on the region's absolute winter minimums and the specific ripening window. Choosing a variety not hardy enough for the local climate results in frozen crowns, while those that ripen too late may suffer from fruit rot during autumn rains.