How to Grow Spinach
Spinacia oleracea
Spinach is a nutritious cool-season leafy green prized for its tender leaves and rapid growth in cooler weather. Gardeners grow it to add iron-rich greens to salads or sautés before the heat of summer arrives.
📷 Wikimedia CommonsStarting Spinach: indoors or direct sow?
🌾 Sow directly in the garden — Spinach is not usually started indoors.
Spinach is best started directly in the garden rather than indoors and transplanted, as seedlings are delicate and prefer being sown where they will grow.
Soil, care & harvest
Prepare loose, fertile soil with a pH between 6.0 and 7.0 for best results. As a cool-season crop, sow seeds directly outdoors 2 to 6 weeks before your last spring frost date since spinach tolerates light frosts well. Press seeds gently into the soil at a depth of about half an inch. Expect germination in 7 to 14 days once conditions are right.
Space plants 3 to 6 inches apart to ensure good air circulation and prevent overcrowding. Spinach does not require trellising or support structures as it grows low to the ground. Keep soil consistently moist with about 1 to 1.5 inches of water weekly, avoiding wetting the leaves directly. Apply a light mulch around the base to retain moisture and suppress weeds.
Watch for aphids, leaf miners, flea beetles, and slugs; use row covers or hand-picking to manage them early. Prevent downy mildew and other fungal issues by ensuring good airflow and avoiding overhead watering. Harvest leaves when they reach a usable size, typically within 25 days of planting, picking outer leaves first for continuous production.
When to Plant Spinach
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | — | June – July | June – September |
| Zone 2 | — | May – July | June – September |
| Zone 3 | — | May – June | May – October |
| Zone 4 | — | April – June | May – October |
| Zone 5 | — | April – May | May – November |
| Zone 6 | — | April – May | April – November |
| Zone 7 | — | March – May | April – November |
| Zone 8 | — | March – April | March – December |
| Zone 9 | — | February – March | February – December |
| Zone 10 | — | January – March | February – December |
| Zone 11 | — | January – February | January – December |
| Zone 12 | — | January – February | January – December |
| Zone 13 | — | January – February | January – December |
Companion Plants for Spinach
✓ Good companions
Fix nitrogen in soil and provide beneficial ground cover
Deep roots don't compete with shallow spinach roots, and carrots help aerate soil
Deter aphids and improve overall garden health with natural pest control
Repels aphids and other pests that commonly attack spinach
Act as trap crop for aphids and flea beetles, protecting spinach
Fix nitrogen in soil which benefits leafy spinach growth
Break up soil for spinach roots and mature quickly without competing for space
Provide ground cover and living mulch while spinach grows vertically
✗ Keep away from
Produces allelopathic compounds that inhibit spinach germination and growth
Heavy feeders that compete for nutrients and may shade out spinach
Allelopathic effects and heavy nutrient competition with shallow-rooted spinach
Nutrition Facts
Per 100g serving (USDA FoodData Central)
