Growli

Plant care

Woodruff (master of the wood) care

Galium odoratum

Also called sweet woodruff, woodruff, master of the wood.

RHS H6USDA 4-8Mildly toxic to petsIndoor 15-30 cm tall

Watering rhythm

5-7days

Keep soil consistently moist; water roughly every 5-7 days in dry weather

Light

Low light (north window or shaded room)

Soil

Moist, humus-rich woodland soil

Humidity

Ambient outdoor

Temp

5-21°C

Pet safety

Mildly toxic to pets

Mature size

15-30 cm tall

Care at a glance

Light

Most houseplants sulk in a dim corner. Woodruff is one of the handful that doesn't. A true shade plant that thrives in partial to full shade. Foliage scorches and growth thins in direct sun, so it is happiest beneath trees and on the shady side of buildings. The tell that you've pushed even a low-light plant too far is soil that stays wet for a week — the plant has stopped transpiring, which means it's stopped using water, which is one short step from rot.

Watering

Water woodruff keep soil consistently moist; water roughly every 5-7 days in dry weather. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. A woodland-floor species that resents drying out. Even moisture keeps the carpet lush; prolonged drought turns foliage brown and crisp at the edges.

Soil and pot

Woodruff grows best in 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. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Woodruff sits happiest at around Ambient outdoor humidity and 5-21°C (41-70°F). Enjoys the cool, moist air of shaded, sheltered gardens; an outdoor groundcover with no special humidity needs beyond a damp, shady situation. If you keep the room above 5 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed woodruff sparingly. Rarely needs feeding in decent woodland soil. An annual spring mulch of leaf mould or garden compost keeps the carpet vigorous; avoid heavy fertiliser, which is unnecessary. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on woodruff in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Aggressive spreadingVigorous rhizomes can overrun neighbouring plants in moist shade; use a barrier or site where it can roam freely.
  • Scorch in sun and droughtFoliage browns in direct sun or dry soil; move to shade and keep the ground consistently moist.
  • Summer dieback when dryHot, dry spells cause the carpet to go dormant and brown; deep mulch and watering keep it green for longer.
  • Thinning in deep dry shadeDry shade under thirsty trees gives sparse cover; improve soil with leaf mould and water during establishment.

Propagation

Simplest by division in spring or autumn, lifting and replanting rooted rhizome sections. It can also be grown from seed, though germination is slow and erratic. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Woodruff is mildly toxic to pets. Not individually listed by the ASPCA; treat with caution and verify with a vet. Sweet woodruff contains coumarin, which in large amounts can affect the liver and clotting, particularly in dogs. Risk from casual nibbling is generally low, but because the ASPCA does not confirm it as non-toxic, do not label it pet-safe. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Woodruff care — frequently asked questions

What is the common name for Galium odoratum?

Galium odoratum is most commonly called Woodruff, but it is also known as sweet woodruff, woodruff, master of the wood. The names refer to the same species, so care instructions for Woodruff apply identically to anything sold as master of the wood.

How much light does woodruff need?

Woodruff grows best in low light (north window or shaded room). A true shade plant that thrives in partial to full shade. Foliage scorches and growth thins in direct sun, so it is happiest beneath trees and on the shady side of buildings.

How often should I water woodruff?

Water woodruff keep soil consistently moist; water roughly every 5-7 days in dry weather. A woodland-floor species that resents drying out. Even moisture keeps the carpet lush; prolonged drought turns foliage brown and crisp at the edges. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is woodruff toxic to cats and dogs?

Woodruff is mildly toxic to pets. Not individually listed by the ASPCA; treat with caution and verify with a vet. Sweet woodruff contains coumarin, which in large amounts can affect the liver and clotting, particularly in dogs. Risk from casual nibbling is generally low, but because the ASPCA does not confirm it as non-toxic, do not label it pet-safe.

What USDA hardiness zone does woodruff grow in?

Woodruff is rated for USDA zone 4-8 (outdoor groundcover) and RHS hardiness H6. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Woodruff deep-dive guides

Every aspect of woodruff care, each with its own calibrated guide:

Related guides

Woodruff is also known as sweet woodruff, woodruff, and master of the wood.