Soil for Rosmarinus officinalis
Use a loose, free-draining mix for rosemary rather than soil that stays wet around the roots. Keep the garden bed, patio pot, or indoor pot setting in view.
Check how the mix holds water and air
Best soil mix
Use a loose, free-draining container medium rather than a dense mix that stays wet around rosemary roots. The exact RHS profile supports soil types including sand and loam, while indoor guidance treats drainage as essential. No universal ingredient ratio is established.
Choose a pot with a drainage hole and do not leave rosemary in saturated compost. The indoor extension response links poor drainage and overwatering with root rot, but the medium should not become hydrophobic or permanently dry.
Separate indoor and outdoor advice
Match the mix to the pot and setting
The evidence covers Salvia rosmarinus, the accepted name for the target Rosmarinus officinalis, in herb-garden, patio-container and indoor-overwintering situations. Those settings do not dry at the same rate, so keep the context visible.
Use an exact target only when one is known
Soil pH
Check the pot, watering and roots too
When soil alone is not the problem
Sources
- Royal Botanic Gardens, Kew: Plants of the World OnlineTaxonomy; accepted name; synonymy
- Royal Botanic Gardens, Kew: Plants of the World OnlineName status; synonymy
- Royal Horticultural SocietySynonyms; Growing conditions; Cultivation
- Ask ExtensionIndoor rosemary response; potting and watering
- Iowa State University Extension and OutreachContainers; potting media; rosemary