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How to Grow Rosemary in Johannesburg

If you're a Johannesburg resident with a passion for gardening or exploring herb cultivation, Rosemary (Rosmarinus officinalis) presents an exciting opportunity. Known for its adaptability to Mediterranean climates, this aromatic herb can thrive in Johannesburg's conditions with the right care and attention.

Rosemary growing in full sun in Johannesburg
Rosemary growing in full sun in Johannesburg

Sunlight Requirements: Rosemary craves sunlight. To ensure its robust growth, provide it with at least 6 to 8 hours of direct sunlight daily. In Johannesburg's sunny and dry climate, finding a spot that receives abundant sunlight throughout the day should be easy. While it can tolerate partial shade, maximizing sunlight exposure will promote its health and vigor.


Water Requirements:

  • Establishment Phase: During the initial growth stages (usually the first few months), Rosemary needs consistent watering to establish a strong root system. Aim for regular watering sessions to support healthy growth.

  • Mature Plants: Once established, Rosemary showcases its drought-resistant qualities. In Johannesburg's dry conditions, mature plants require less frequent watering. Occasional deep watering (approximately once a week) during extended dry periods is sufficient to maintain their health.

  • Soil Moisture Assessment: Before watering, check the soil moisture by inserting your finger into the soil near the plant base. If the top 2.5 cm of the soil feels dry to the touch, it's an indication that the plant might need watering.

  • Observation of Plant Behavior: Pay attention to the plant's behavior. Wilting or drooping leaves are signs that the plant might be under stress due to lack of water. However, with Rosemary, slight wilting during midday heat is common and not necessarily a sign of needing immediate watering.

  • Watering Frequency: In Johannesburg's climate, especially during dry seasons, aim for consistent, deep watering sessions rather than frequent shallow watering. Deep watering encourages the roots to grow deeper into the soil.

  • Watering Techniques: 'Deep watering' refers to either submerging the pot partially in water, or having a pipe in the soil that takes the water straight down to the base of the roots. If the soil is well drained (airy, course and fluffy), no special technique is needed.

  • Time of Day: Water Rosemary early in the morning to allow foliage to dry before the heat of the day. Avoid watering late in the evening to prevent prolonged moisture on leaves, which can invite fungal diseases..


A rosemary plant in a paper planter pot
These Rosemary pot that you may buy from Woolworths already has the right soil. Just give it plenty of sunlight. However, when you bring it home from the shop, first keep it indoors for 2 days to allow them to adjust to the new climate.

Optimizing Growth Conditions:

  • Soil Quality: Ensure the soil is well-drained to prevent waterlogging, particularly during Johannesburg's occasional rainy seasons. For containers, you can tell by seeing if when you water from the top, the water comes out the bottom quickly.

  • Container Gardening: If growing Rosemary in containers, monitor soil moisture closely, as containers can dry out faster. However, they can also become water logged if the wrong potting soil was used. Adjust watering frequency accordingly to maintain proper soil moisture levels.

  • Mulching Benefits: Consider mulching around the plant base. Mulch helps in retaining soil moisture, reducing water evaporation, and moderating soil temperature. Organic materials like wood chips or straw can serve as effective mulch.

  • Spacing: Proper spacing between plants facilitates airflow and sunlight penetration, fostering healthy growth.

  • Hail and Frost: Given Johannesburg's occasional hailstorms and frost, be prepared to shield your Rosemary plant during extreme weather conditions. Cover the plant with a frost cloth or a protective layer to mitigate damage during hail or frost events.

Course soil with twigs in it
Example of what course, potting soil should look like for Rosemary

If you remember anything, remember this:

  • Maximize sunlight exposure by planting Rosemary in areas with abundant sunlight.

  • Avoid overwatering, especially once Rosemary plants are established, to prevent root rot.

Conclusion: By understanding Rosemary's sunlight and water needs and optimizing growing conditions, cultivating this versatile herb in Johannesburg can be a fulfilling and rewarding experience. Whether in gardens or containers, Rosemary's adaptability and resilience make it an excellent addition to Johannesburg's diverse plant life. Remember Rosemary originates from a Mediterranean climate so the closer you replicate those conditions, the more successful you will be.


Comment on the post if you have any tips to share with others.


Information source: https://www.doc-developpement-durable.org/file/Culture/Plantes-Medicinales-Aromatiques/FICHES_PLANTES/prodGuideRosemary.pdf

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