grow · Grow

How to Grow Spinach Indoors

Spinach thrives indoors with cool temperatures, consistent moisture, and moderate light. Plant seeds directly in containers at least 6 inches deep, keep soil evenly moist, and harvest outer leaves when they reach 2-3 inches. From seed to harvest takes 40-50 days, and you can keep cutting leaves for weeks.

Ingredients

Step by step

  1. Choose the right container. Use containers at least 6 inches deep with drainage holes. Window boxes work perfectly. Spinach roots need room to spread, so avoid anything too shallow.
  2. Fill with quality potting mix. Use a well-draining potting soil, not garden dirt. Mix in a handful of compost if you have it. Fill containers to within an inch of the rim.
  3. Plant seeds directly. Scatter seeds about half an inch apart and cover with a quarter-inch of soil. No need to be precise—you'll thin them later. Water gently until soil is evenly moist.
  4. Place in cool, bright spot. Find a spot that gets 4-6 hours of sunlight or use grow lights. Spinach prefers temperatures between 50-70°F. Too warm and it bolts to seed quickly.
  5. Keep soil consistently moist. Check daily and water when the top inch feels dry. Spinach hates drought stress. Use room temperature water and pour slowly to avoid disturbing seeds.
  6. Thin seedlings after germination. When seedlings have their first true leaves, thin to 3-4 inches apart. Use scissors rather than pulling to avoid disturbing roots of remaining plants.
  7. Harvest outer leaves first. Start cutting when leaves reach 2-3 inches long. Take the outer leaves and let the center keep growing. Cut with clean scissors about an inch above soil level.

Tips & troubleshooting

Variations

Questions

How long does spinach take to grow indoors?
From seed to first harvest takes 40-50 days. Once established, you can harvest leaves weekly for 6-8 weeks before plants bolt.
Can I regrow spinach from store-bought leaves?
No, you need the root system intact. Buy spinach plants with roots or start from seeds. Cut spinach from the store won't regrow.
Why did my spinach bolt so quickly?
Too much heat or long daylight hours trigger bolting. Keep plants cool and consider varieties bred for bolt resistance if your space runs warm.
How often should I water indoor spinach?
Check daily and water when the top inch of soil feels dry. This usually means every 2-3 days, but depends on your container size and room conditions.
Can I grow spinach without a sunny window?
Yes, grow lights work well. Position them 6-12 inches above plants and run for 12-14 hours daily. Spinach doesn't need intense light like tomatoes.

Further reading