Choosing the right soil mix for vegetable outdoor plant boxes is crucial for healthy plant growth and bountiful harvests. The ideal blend should provide proper drainage, aeration, and nutrient retention. A recommended mix consists of:

1. 50% High-Quality Garden Soil: Provides a solid base and essential minerals.

2. 30% Organic Compost: Enriches the soil with nutrients and improves moisture retention.

3. 20% Perlite or Coarse Sand: Enhances drainage and prevents soil compaction.

For optimal results, consider adding worm castings or aged manure for extra fertility. Avoid using heavy clay or pure potting soil, as they can hinder root development. Regularly test the soil pH (6.0–7.0 is ideal for most vegetables) and amend as needed with lime or sulfur.

By using this balanced soil mix, your vegetable plants will thrive, producing robust yields throughout the growing season. Happy gardening!