Repotting guide

When & how to repot Lemon Thyme (Thymus × citriodorus)

Also called Lemon Thyme, Citrus Thyme.

More about lemon thyme

About Lemon Thyme

Thymus × citriodorus · also called Lemon Thyme, Citrus Thyme · herb

Lemon Thyme is a hybrid between Thymus vulgaris and Thymus pulegioides, producing a low, mounding sub-shrub with a fresh lemon-thyme scent. Available in green, gold-variegated, and silver-edged forms, it doubles as an ornamental ground cover. Hardy and drought-tolerant once established, it performs best in full sun with sharply drained soil.

Mature size: 15–30 cm tall, 40–60 cm wide

Watch for — Root rot in wet soils: This hybrid is less tolerant of wet roots than it appears. Waterlogged conditions in winter are a primary cause of death. Ensure raised beds or very gritty container mixes. In wet climates, plant on a slight slope or in raised rockery pockets.

How to tell lemon thyme needs repotting

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

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

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 lemon thyme

Every 2–3 years, into bone-dry mix. Lemon Thyme's growth habit — low-mounding, woody-based sub-shrub; slightly more spreading than common thyme with soft, small ovate leaves; pale lilac to pink flowers in early summer — sets the pace. Lemon Thyme is a hybrid between Thymus vulgaris and Thymus pulegioides, producing a low, mounding sub-shrub with a fresh lemon-thyme scent. Available in green, gold-variegated, and silver-edged forms, it doubles as an ornamental ground cover. Hardy and drought-tolerant once established, it performs best in full sun with sharply drained soil.

What size pot to step lemon thyme up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Lemon Thyme 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 lemon thyme

Spring or summer, while lemon thyme 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 lemon thyme

Repot dry. Do not water lemon thyme for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty gritty, free-draining, low-fertility soil ready.
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.
Pot into dry mix. Set lemon thyme at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
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 lemon thyme 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 lemon thyme

Lemon Thyme wants gritty, free-draining, low-fertility soil. Thrives in sandy or chalky soils with a pH of 6.5–8.0. Amend heavy soils with grit or coarse sand before planting. For containers use a 50:50 mix of loam-based compost and horticultural grit. Rich, damp soils cause root rot and lose aromatic intensity. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting lemon thyme — frequently asked questions

How often should you repot lemon thyme?

Every 2–3 years, into bone-dry mix for lemon thyme. Repot lemon thyme every 2–3 years into a snug pot of gritty, free-draining, low-fertility soil, 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 lemon thyme need?

When is the best time of year to repot lemon thyme?

Should you water lemon thyme after repotting?

No — not straight away. Repot lemon thyme 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 lemon thyme after repotting?

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