Garlic Container Soil Mix
Allium sativum
Fall-planted, cold-vernalized bulb crop that wants free-draining, organic-rich soil at near-neutral pH.
- Container:
- 5 gal wide pot, ~6 cloves
- pH:
- 6–7
- EC:
- 1.4–2 mS/cm
- Sun:
- 6–8 hr
- Light:
- Full sun
Components
Percentages by volume. Quantities scaled for a 5-gallon container (US units).
| Component | % | Amount |
|---|---|---|
| Quality potting mix Base structure, initial nutrients | 45% | 9 qt |
| Aged compost Microbial diversity | 20% | 4 qt |
| Coco coir (low-EC, buffered) CEC, moisture buffering | 15% | 3 qt |
| Perlite Drainage, aeration | 10% | 2 qt |
| Vermicompost / Worm castings Nutrients, microbes, growth hormones | 10% | 2 qt |
Per-container amendments
Scaled linearly to your container size. Apply at transplant or as side-dress per the notes on each line.
- Balanced organic fertilizer (4-4-4 / 5-5-5) Mix in at fall planting; top-dress lightly in early spring as shoots emerge.2–4 tbsp
- Bone meal Slow P + Ca; mix into root zone at planting.2–3 tbsp
- Kelp meal Potassium boost for bulb formation.1–2 tbsp
Growing notes
- Plant cloves in fall, 1-2 weeks after first killing frost; needs cold for proper bulbing.
- Set cloves point-up, base 2-3 inches below surface, 6 inches apart in a wide pot.
- Mulch 3-4 inches with straw or leaves to buffer winter temperature swings.
- Hardneck varieties suit cold climates; softneck stores longer.
- Stop nitrogen by first week of May — late N delays bulbing.
- Stop watering ~2 weeks before harvest; pull when half the upper leaves are still green.
- Snap off scapes on hardnecks to direct energy into bulb size; cure 3-4 weeks before storage.
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
- Growing garlic in home gardens — University of Minnesota Extension . University of Minnesota Extension
- FS1233: Growing Garlic in the Home Garden — Frederick P., Leviant E., Hlubik W. — Rutgers NJAES . Rutgers NJAES
- How to grow garlic — Royal Horticultural Society . RHS