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Catlin's Giant Bugle (Giant Bugleweed) care

Ajuga reptans 'Catlin's Giant'

Also called Catlin's Giant Bugle, Giant Bugleweed, Carpet Bugle.

RHS H7USDA 3–9Mildly toxic to petsIndoor 20–30 cm tall in flower

Watering rhythm

Medium indirect light (a couple of metres from a window)

Once or twice weekly during establishment; once weekly once established

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Light

Medium indirect light (a couple of metres from a window)

Soil

Moist, well-draining loam or humus-rich soil

Humidity

40–70%

Temp

-20°C to 30°C

Pet safety

Mildly toxic to pets

Mature size

20–30 cm tall in flower

Care at a glance

Light

Catlin's Giant Bugle wants the spot a few feet back from a sunny window — bright enough to read a paperback at noon, but the sun never falls directly on the leaves. Performs best in partial shade to dappled light (2–4 hours indirect sun). Tolerates full shade but foliage colour may be less intense. Avoid prolonged intense afternoon sun, which scorches the large leaves and fades the bronze colouring. A faint hand shadow at midday is the right amount; a sharp dark shadow means it's getting direct sun and probably too much.

Watering

Water catlin's giant bugle once or twice weekly during establishment; once weekly once established. 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. Keep soil consistently moist but not waterlogged. Drought-tolerant once established, but wilts quickly in dry spells given its large leaf surface area. Water deeply during hot, dry summers. Reduce watering in winter dormancy.

Soil and pot

Catlin's Giant Bugle grows best in moist, well-draining loam or humus-rich soil. Prefers fertile, moisture-retentive loam with good drainage. Tolerates clay soils better than many groundcovers. Amend heavy clay with compost to improve drainage. A pH of 5.5–7.0 is ideal. Avoid very sandy or dry soils. 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

Catlin's Giant Bugle sits happiest at around 40–70% humidity and -20°C to 30°C (-4°F to 86°F). Adapted to outdoor temperate conditions and not humidity-sensitive. In dry climates, mulching around the crown helps retain soil moisture and maintains a microclimate that suits the plant. No special humidity management needed for garden use. If you keep the room above 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 catlin's giant bugle sparingly. Apply a balanced granular fertiliser (e.g. 10-10-10) in early spring as new growth emerges. A single annual feed is sufficient; over-fertilising promotes lush foliage at the expense of flowers and can encourage crown rot. 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 catlin's giant bugle in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Crown rot — The most common problem, especially in poorly drained or overly dense plantings. Improve air circulation by thinning crowded colonies in autumn and ensure the planting site drains freely. Avoid overhead watering in cool, wet weather.
  • Powdery mildew — Can appear in humid, shaded conditions with poor airflow. Space plants adequately (30–40 cm apart) and remove affected leaves promptly. A dilute neem oil or potassium bicarbonate spray controls mild outbreaks.
  • Invasive spreading — Runners root readily and can spread beyond desired areas. Edge planting beds regularly in spring and autumn with a spade to contain the colony. Avoid planting adjacent to lawn where it will outcompete grass.

Propagation

Division in spring or autumn is the easiest method — lift clumps, separate rooted rosettes and replant 30–40 cm apart. Rooted stolons can be detached and potted individually. Seed propagation is possible but slow and cultivar traits may not come true. 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

Catlin's Giant Bugle is mildly toxic to pets. Ajuga reptans is not listed individually by the ASPCA as toxic, but the genus Ajuga contains iridoid glycosides and has been associated with mild digestive upset in dogs and cats if ingested in quantity. Exercise caution around pets that graze on foliage; serious toxicity is not reported. 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.

Catlin's Giant Bugle care — frequently asked questions

What is the common name for Ajuga reptans 'Catlin's Giant'?

Ajuga reptans 'Catlin's Giant' is most commonly called Catlin's Giant Bugle, but it is also known as Catlin's Giant Bugle, Giant Bugleweed, Carpet Bugle. The names refer to the same species, so care instructions for Catlin's Giant Bugle apply identically to anything sold as Giant Bugleweed.

How much light does catlin's giant bugle need?

Catlin's Giant Bugle grows best in medium indirect light (a couple of metres from a window). Performs best in partial shade to dappled light (2–4 hours indirect sun). Tolerates full shade but foliage colour may be less intense. Avoid prolonged intense afternoon sun, which scorches the large leaves and fades the bronze colouring.

How often should I water catlin's giant bugle?

Water catlin's giant bugle once or twice weekly during establishment; once weekly once established. Keep soil consistently moist but not waterlogged. Drought-tolerant once established, but wilts quickly in dry spells given its large leaf surface area. Water deeply during hot, dry summers. Reduce watering in winter dormancy. 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 catlin's giant bugle toxic to cats and dogs?

Catlin's Giant Bugle is mildly toxic to pets. Ajuga reptans is not listed individually by the ASPCA as toxic, but the genus Ajuga contains iridoid glycosides and has been associated with mild digestive upset in dogs and cats if ingested in quantity. Exercise caution around pets that graze on foliage; serious toxicity is not reported.

What USDA hardiness zone does catlin's giant bugle grow in?

Catlin's Giant Bugle is rated for USDA zone 3–9 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Catlin's Giant Bugle deep-dive guides

Every aspect of catlin's giant bugle care, each with its own calibrated guide:

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Catlin's Giant Bugle qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Catlin's Giant Bugle is also known as Catlin's Giant Bugle, Giant Bugleweed, and Carpet Bugle.