Limestone House Foundation: Does It Affect Soil pH?

Solid limestone walls do not alter soil pH. Only when limestone weathers to fine particles over decades does it release calcium.

Real Issue for Roses

Rose defoliation is likely due to disease (black spot), not soil pH. Test soil anyway; roses prefer 6.0–6.5.

Action

• Soil test to confirm pH.
• Improve air circulation around roses.
• Apply preventive fungicide if needed.

Don’t amend for a non-existent limestone effect.