How deep should a container be to grow spinach?
Written by
Olivia Mitchell
Reviewed by
Prof. Charles Hartman, Ph.D.Container-grown spinach overcomes space challenges, while also providing nutrition. Many vegetable gardeners wonder how deep a pot must be to allow healthy roots. Shallow containers about 6-8 inches are sufficient because spinach is a surface rooting plant. Going deeper only utilizes soil without purpose.
Root Requirements
- Shallow 6-8 inch depth accommodates 90% of roots
- Minimum 12-inch width prevents overcrowding
- Vertical space doesn't increase yield significantly
Drainage Setup
- Three 0.5 inch holes per square foot mandatory
- Elevate pots on bricks for airflow underneath
- Line holes with landscape fabric to prevent clogging
Choosing container materials affects moisture regulation. Plastic retains moisture better, which means you do not have to check and water as frequently. Terracotta is porous, providing better air circulation and reducing the likelihood of waterlogged roots. Select your material choice based on your climate for optimal results.
Soil composition is more important to spinach health than depth. Use 70% potting mix for structure and 30% compost for nutrients. This mix allows air to reach the plant roots while also providing essential nutrients. Check for drainage before planting by fully saturating the soil and timing how long it takes for the water to drain away.
Sow seeds half inch deep with two inches between them. When true leaves appear, thin seedlings. Water lightly daily until germination, then deeply when the soil dries. Protect with shade cloth when temperatures exceed 80°F to avoid bolting.
Read the full article: How to Grow Spinach in Containers Successfully
