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Repotting guide

When & how to repot Rosemary (Rosmarinus officinalis)

Also called Rosemary, Common Rosemary.

More about rosemary

About Rosemary

Rosmarinus officinalis · also called Rosemary, Common Rosemary · herb

An iconic evergreen Mediterranean shrub with aromatic, needle-like leaves used widely in culinary and ornamental settings. Thrives in full sun and well-drained, lean soil; highly drought-tolerant once established. Hardy in USDA zones 8–11, with cold-hardy cultivars surviving in zone 6–7. Produces pale blue flowers in spring and sporadically through the year.

Mature size: 60–150 cm tall (24–60 in), 60–120 cm spread (24–48 in)

Watch for — Root rot from overwatering: The most common problem. Leaves yellow, then the plant collapses from the base. Ensure excellent drainage, avoid saucers under pots, and water only when soil is dry. There is no recovery from severe root rot — prevention is essential.

How to tell rosemary needs repotting

Repotting on a calendar is less reliable than reading the plant. For rosemary, watch for these signs:

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot rosemary

Every 2–3 years, into bone-dry mix. Rosemary's growth habit — upright, bushy, evergreen shrub with dense, woody stems and narrow, needle-like grey-green leaves with silvery undersides — sets the pace. An iconic evergreen Mediterranean shrub with aromatic, needle-like leaves used widely in culinary and ornamental settings. Thrives in full sun and well-drained, lean soil; highly drought-tolerant once established. Hardy in USDA zones 8–11, with cold-hardy cultivars surviving in zone 6–7. Produces pale blue flowers in spring and sporadically through the year.

What size pot to step rosemary up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Rosemary stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot rosemary

Spring or summer, while rosemary is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting rosemary

  1. Repot dry. Do not water rosemary for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
  2. Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty poor to moderately fertile, sharply drained sandy or gritty soil, ph 6.0–8.0 ready.
  3. Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
  4. Pot into dry mix. Set rosemary at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
  5. Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep rosemary completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for rosemary

Rosemary wants poor to moderately fertile, sharply drained sandy or gritty soil, ph 6.0–8.0. Rosemary thrives in lean, alkaline to neutral, sharply draining soil. Avoid rich, wet soils that promote lush but frost-tender growth. Add grit to heavy clay soils, or grow in containers with a gritty, free-draining compost. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting rosemary — frequently asked questions

How often should you repot rosemary?

Every 2–3 years, into bone-dry mix for rosemary. Repot rosemary every 2–3 years into a snug pot of poor to moderately fertile, sharply drained sandy or gritty soil, ph 6.0–8.0, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does rosemary need?

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Rosemary stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes. Use our pot size calculator to size it from the plant's current pot and root spread.

When is the best time of year to repot rosemary?

Spring or summer, while rosemary is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Should you water rosemary after repotting?

No — not straight away. Repot rosemary into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise rosemary after repotting?

Not immediately. Wait about 3 weeks after repotting rosemary. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.

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