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Plant care

Spiraea 'Magic Carpet' (Magic Carpet Spirea) care

Spiraea japonica 'Magic Carpet'

Also called Magic Carpet Spirea, Walbuma Spirea.

RHS H7USDA 3-9Mildly toxic to petsIndoor 30-45 cm tall

Watering rhythm

7-10days

When the top 3-5 cm of soil is dry, roughly every 7-10 days during the growing season

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Light

Direct sun (at least 4-6 hours)

Soil

Well-drained, fertile garden soil or quality container compost

Humidity

40-70%

Temp

-25 to 38°C

Pet safety

Mildly toxic to pets

Mature size

30-45 cm tall

Care at a glance

Light

Spiraea 'Magic Carpet' needs sun on the leaves, not just bright ambient room light. Requires full sun (minimum 6 hours daily) to achieve the best foliage colour progression from red-orange to gold and the most prolific flowering. In shade the foliage remains green and flowering is poor. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water spiraea 'magic carpet' when the top 3-5 cm of soil is dry, roughly every 7-10 days during the growing season. 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. Water regularly during establishment. Mature plants are reasonably drought-tolerant but the colourful foliage is prone to tip scorch during prolonged dry periods. Mulch to conserve soil moisture.

Soil and pot

Spiraea 'Magic Carpet' grows best in well-drained, fertile garden soil or quality container compost. Tolerates a broad pH of 5.0-7.5 and most soil textures. In containers, use a free-draining peat-free compost with perlite. Avoid waterlogged or compacted 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

Spiraea 'Magic Carpet' sits happiest at around 40-70% humidity and -25 to 38°C (-13 to 100°F). Standard outdoor shrub; no specific humidity requirements. Functions well in normal temperate conditions whether in borders or containers. 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 spiraea 'magic carpet' sparingly. Apply a balanced slow-release fertiliser in early spring. In containers, supplement with a fortnightly liquid feed during the growing season. Avoid high-nitrogen formulations, which reduce foliage colour intensity. 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 spiraea 'magic carpet' in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Loss of orange-red spring colour — Insufficient light is the primary cause. Ensure full sun; shade turns the vibrant foliage colours to flat green.
  • Leaf tip scorch — Colourful foliage is susceptible to tip-burn during drought. Water consistently and apply mulch to buffer soil moisture.
  • Powdery mildew — Favoured by dry roots and high humidity. Maintain consistent soil moisture and ensure good air circulation.
  • Aphids — New growth in spring is vulnerable. Monitor closely and treat with insecticidal soap or a water jet at first sign.

Companion plants

Spiraea 'Magic Carpet' pairs well with Festuca glauca 'Elijah Blue', Ajuga reptans 'Burgundy Glow', Thymus serpyllum, and Sedum 'Autumn Joy'. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Propagate by softwood cuttings in early summer (8-10 cm lengths) with rooting hormone in a perlite-based mix. Division of the clump in early spring is reliable for small-scale propagation. 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

Spiraea 'Magic Carpet' is mildly toxic to pets. Spiraea japonica 'Magic Carpet' is not individually listed by the ASPCA. The genus lacks formal non-toxic clearance; mild gastrointestinal upset in pets following ingestion of plant material is plausible, warranting a precautionary mildly-toxic classification. 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.

Spiraea 'Magic Carpet' care — frequently asked questions

What is the common name for Spiraea japonica 'Magic Carpet'?

Spiraea japonica 'Magic Carpet' is most commonly called Spiraea 'Magic Carpet', but it is also known as Magic Carpet Spirea, Walbuma Spirea. The names refer to the same species, so care instructions for Spiraea 'Magic Carpet' apply identically to anything sold as Magic Carpet Spirea.

How much light does spiraea 'magic carpet' need?

Spiraea 'Magic Carpet' grows best in direct sun (at least 4-6 hours). Requires full sun (minimum 6 hours daily) to achieve the best foliage colour progression from red-orange to gold and the most prolific flowering. In shade the foliage remains green and flowering is poor.

How often should I water spiraea 'magic carpet'?

Water spiraea 'magic carpet' when the top 3-5 cm of soil is dry, roughly every 7-10 days during the growing season. Water regularly during establishment. Mature plants are reasonably drought-tolerant but the colourful foliage is prone to tip scorch during prolonged dry periods. Mulch to conserve soil moisture. 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 spiraea 'magic carpet' toxic to cats and dogs?

Spiraea 'Magic Carpet' is mildly toxic to pets. Spiraea japonica 'Magic Carpet' is not individually listed by the ASPCA. The genus lacks formal non-toxic clearance; mild gastrointestinal upset in pets following ingestion of plant material is plausible, warranting a precautionary mildly-toxic classification.

What USDA hardiness zone does spiraea 'magic carpet' grow in?

Spiraea 'Magic Carpet' 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.

Spiraea 'Magic Carpet' deep-dive guides

Every aspect of spiraea 'magic carpet' care, each with its own calibrated guide:

Featured in these plant shortlists

Spiraea 'Magic Carpet' qualifies for 4 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Spiraea 'Magic Carpet' is also commonly called Magic Carpet Spirea or Walbuma Spirea.