To plant basil successfully, the recommended spacing varies somewhat depending on the source and growing conditions, but generally falls within these guidelines:
- For garden rows, space basil plants about 6 inches apart within rows, with rows 24 to 36 inches apart. Alternatively, planting in beds with 3 rows spaced 12 inches apart and 12 inches between plants in each row is also suggested
- When growing basil in containers or pots, spacing of about 4 inches between plants is sufficient for seedlings, but mature plants should be spaced about 12 inches (30 cm) apart to allow healthy growth and airflow
- The Royal Horticultural Society recommends spacing basil plants 20–30 cm (8–12 inches) apart outdoors or in containers to prevent overcrowding, which can cause premature flowering and reduce harvest quality
- Another practical spacing guideline is 12 to 16 inches apart to ensure good sunlight exposure and airflow, which helps prevent disease and promotes bushy growth
- For some varieties, closer spacing of 5 to 7 inches may be used, especially for bushy types, but upright varieties may need a bit more room
In summary, for most home garden and container growing, spacing basil plants about 12 inches apart is optimal, while seedlings can start closer (3-6 inches) and be thinned as they grow. Rows in the garden are typically spaced 24 to 36 inches apart with plants 6 inches apart within rows for larger scale production
