Coffee Grounds for Raspberries/Blueberries in Alkaline Soil: Helps Biology, Not pH Much

Alkaline soil, raised raspberries with some success. Heard coffee grounds acidify for raspberries/blueberries. Reality: used grounds pH ~6.7 (near neutral) — acid brewed out. Some alkaline soils never acidify regardless.

What Coffee Grounds Actually Do

• Free at Starbucks — daily dose feeds soil biocommunity.
• Slow-release nutrients, earthworm attractant.
• Modest pH dip — every bit counts, but don't expect miracles.
• Combine with citrus rinds/pith + OJ in compost for more acid push.

Critical: Compost First

Direct application of fresh organic matter can temporarily harm nearby growth (rotting consumes compounds). Compost fully, then apply.

Blueberries May Not Work

Depends on soil test. Some alkaline soils resist change. Test first — then decide if battle is winnable.