SOURCE-BACKED GUIDANCE
Plant spacing
Compare common sweet-basil spacing with closer RHS guidance for young and compact plants.
Common sweet basil
- Plant spacing
- 6–12 in
University of Minnesota final spacing after thinning or transplanting; account for variety size. [1]
Outdoor seedlings
- Plant spacing
- 10–20 cm (4–8 in)
RHS thinning guidance for outdoor-sown basil. [2]
Minimum general spacing
- Plant spacing
- At least 10 cm (4 in)
RHS minimum spacing guidance. [2]
Growing-method context
Use a warm, sheltered growing position and adjust the selected value for the mature size of the variety. [1][2]
Planning notes
The RHS material covers multiple Ocimum species and varieties; the scientific name above identifies the common sweet-basil focus of this page. [1][2]
TURN GUIDANCE INTO A LAYOUT
Use the Plant Spacing Calculator
Choose the source entry that matches your plant and growing method, then enter that spacing yourself. The calculator applies only the geometry you provide.
Sources
- University of Minnesota Extension: Growing basil in home gardensReviewed by Grownestia 2026-09-08
- Royal Horticultural Society: How to grow basilReviewed by Grownestia 2026-09-08