Rosemary Container Soil Mix
Salvia rosmarinus
Lean, gritty, sharply-drained Mediterranean mix — root rot is the #1 killer.
- Container:
- 2-7 gal (terracotta preferred)
- pH:
- 6.5–7.5
- Sun:
- 6–8 hr
- Light:
- Full sun (6+ hours)
Components
Percentages by volume. Quantities scaled for a 3-gallon container (US units).
| Component | % | Amount |
|---|---|---|
| Quality potting mix Base structure, initial nutrients | 40% | 5 qt |
| Pumice Drainage, aeration (lower water requirement) | 25% | 3 qt |
| Coarse sand Mimics native sandy loam, drainage | 15% | 2 qt |
| Perlite Drainage, aeration | 10% | 1 qt |
| Aged compost Microbial diversity | 10% | 1 qt |
Per-container amendments
Scaled linearly to your container size. Apply at transplant or as side-dress per the notes on each line.
- Garden lime Nudges pH toward the neutral-alkaline range rosemary prefers.1–2 tbsp
- Basalt rock dust or azomite Slow-release minerals without pushing soft growth.2 tbsp
- Mycorrhizae inoculant Apply directly on root ball at transplant; rosemary strongly mycorrhizal.1 tsp
Growing notes
- Rosemary evolved on rocky Mediterranean hillsides — favor drainage over fertility every time.
- A terracotta pot helps wick moisture away from the rootball.
- Water deeply, then let the top 2" dry out before watering again. Yellow lower leaves = overwatered.
- Avoid heavy compost and rich fertilizers; they push soft growth that winter-kills and dilutes essential oils.
- In zones colder than 7, bring indoors before frost and place at the brightest window available.
Want to scale this to a different container size, save it to a plot plant, or track applied dates? Open it in the interactive calculator.
References
- Rosemary — University of Maryland Extension . University of Maryland Extension
- Cultural Tips for Growing Rosemary — UC Statewide IPM Program . University of California Agriculture & Natural Resources
- Growing herbs in home gardens — University of Minnesota Extension . University of Minnesota Extension