Repotting guide
When & how to repot Woodruff (Galium odoratum)
Also called sweet woodruff, woodruff, master of the wood.
More about woodruff
About Woodruff
Galium odoratum · also called sweet woodruff, woodruff · herb
Sweet woodruff is a low, spreading woodland groundcover with whorls of bright green, star-shaped leaves and a froth of tiny white spring flowers. Dried foliage smells of new-mown hay from its coumarin content and was used to scent linen and flavour drinks. It carpets shady, moist ground quickly, making excellent weed-suppressing cover beneath shrubs and trees.
Mature size: 15-30 cm tall, spreading indefinitely as groundcover.
How to tell woodruff needs repotting
Repotting on a calendar is less reliable than reading the plant. For woodruff, watch for these signs:
- Roots circling the bottom of the module or pot, or poking out of the drainage holes.
- The seedling dries out within a day and growth has visibly stalled.
- Roots are white and matted in a tight spiral when you tip the plant out.
- It has outgrown its current container for the stage of the season — pot woodruff on before it becomes hard root-bound.
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 woodruff
Pot on seedlings as they grow; not a perennial repot. Woodruffis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Low, mat-forming herbaceous perennial spreading by creeping rhizomes to form a dense groundcover carpet; dies back in hard winters and regrows in spring..
What size pot to step woodruff up to
Pot woodruff on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.
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 woodruff
Pot woodruff on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.
Step-by-step: repotting woodruff
- Pot on before it is root-bound. Check woodruff regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
- Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
- Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
- Pot into rich mix. Set it into fresh moist, humus-rich woodland soil at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
- Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.
Aftercare
Water woodruff in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.
The right soil mix for woodruff
Woodruff wants moist, humus-rich woodland soil. Loves leaf-mould-rich, moisture-retentive soil. Add compost or leaf mould to improve any thin ground. Tolerates a range of pH but performs best in cool, evenly moist conditions. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.
Repotting woodruff — frequently asked questions
How often should you repot woodruff?
Pot on seedlings as they grow; not a perennial repot for woodruff. Woodruff is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into moist, humus-rich woodland soil so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.
What size pot does woodruff need?
Pot woodruff on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check. 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 woodruff?
Pot woodruff on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.
Can you put woodruff straight into a much bigger pot?
No. Even a fast-growing woodruff should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.
Should you fertilise woodruff after repotting?
Not immediately. Wait about 1 week after repotting woodruff. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.
Related guides
- Woodruff care — light, water, soil and common problems
- How often to water woodruff — the watering brief
- How to repot a plant — the complete step-by-step method
- Root-bound plant — how to spot and fix it
- Pot size calculator — size the next pot correctly
- When & how to repot basil
- When & how to repot herb garden
- When & how to repot mint
- All 3899 repotting guides in the Growli library