Soil on citrus
What's Happening
Indoor citrus soil issues arise from two primary factors: (1) alkaline pH (>7.5) from hard tap water and fertilizer salts that lock out iron, magnesium, and zinc, causing micronutrient deficiencies; and (2) poor drainage from heavy potting mixes that retain excessive moisture, leading to anaerobic root rot conditions. Container citrus require slightly acidic, exceptionally well-draining soil that mimics their native Mediterranean/subtropical growing conditions.
How to Fix It
- 1
Test soil pH: Use test strips or meter—target 6.0-6.5; adjust with sulfur if too alkaline
- 2
Create proper mix: Blend 40% potting soil + 30% perlite + 20% coarse sand + 10% compost for drainage
- 3
Improve existing soil: If drainage is poor, carefully repot into new mix; do not amend in-place
- 4
Flush salts monthly: Run 3-4 pot volumes of plain water through soil, let drain completely
- 5
Check drainage speed: Water should exit holes within 30 seconds; if slower, add more perlite
- 6
Repot on schedule: Every 2-3 years or when roots circle pot—use fresh citrus/cactus mix
How to Prevent It
Use citrus-specific potting mix or create blend: 40% high-quality potting soil + 30% perlite/pumice + 20% coarse sand + 10% compost. Maintain pH 6.0-6.5. Flush soil with 3-4 pot volumes of plain water monthly to leach salts. Use rainwater or distilled water when possible. Repot every 2-3 years in fresh mix.