Spinach Container Soil Mix
Spinacia oleracea
Cool-season nitrogen-hungry green that prefers a near-neutral, well-amended container mix.
- Container:
- 2 gal wide planter
- pH:
- 6.5–7.5
- EC:
- 1.2–2 mS/cm
- Sun:
- 4–6 hr
- Light:
- Part to full sun; cooler the better
Components
Percentages by volume. Quantities scaled for a 2-gallon container (US units).
| Component | % | Amount |
|---|---|---|
| Quality potting mix Base structure, initial nutrients | 45% | 3.5 qt |
| Vermicompost / Worm castings Nutrients, microbes, growth hormones | 25% | 2 qt |
| Coco coir (low-EC, buffered) CEC, moisture buffering | 15% | 1 qt |
| Perlite Drainage, aeration | 10% | 3.25 cup |
| Aged compost Microbial diversity | 5% | 1.5 cup |
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 planting; side-dress lightly mid-cycle.1–2 tbsp
- Garden lime Only if base mix tests below pH 6.5.1–2 tsp
Growing notes
- Day-length sensitive — long spring days plus heat or drought triggers bolting.
- Sow as soon as soil is workable; repeat every 1-2 weeks until temps reach 80 F.
- Provide ~1 inch of water per week to delay bolting and maximize tender leaves.
- A fall sowing in mid-to-late August grows reliably under shortening days.
- Spinach tolerates higher pH than most greens — aim 6.5-7.5; lime if your mix runs acidic.
- Skip fresh manure; use well-rotted compost or vermicompost only.
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 spinach and Swiss chard in home gardens — University of Minnesota Extension . University of Minnesota Extension