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Plant care

Aster 'Hella Lacy' (Hella Lacy aster) care

Symphyotrichum novae-angliae 'Hella Lacy'

Also called Hella Lacy aster, New England aster, Michaelmas daisy.

RHS H7USDA 4-8Mildly toxic to petsIndoor 100-140 cm tall

Watering rhythm

7-10days

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

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Light

Direct sun (at least 4-6 hours)

Soil

Average to moderately fertile, well-drained soil

Humidity

40-65%

Temp

-25 to 30°C

Pet safety

Mildly toxic to pets

Mature size

100-140 cm tall

Care at a glance

Light

Most houseplants will scorch where aster 'hella lacy' thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun is preferred; 6+ hours daily supports upright growth and prolific flower production. Partial shade is tolerated but increases the risk of powdery mildew and reduces flower density. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for when the top 3-5 cm of soil is dry, roughly every 7-10 days for aster 'hella lacy', but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Fairly drought tolerant once established. Water at the base to avoid wetting the foliage, which is susceptible to fungal diseases. Keep consistently moist through the first growing season to establish a strong root system.

Soil and pot

Aster 'Hella Lacy' grows best in average to moderately fertile, well-drained soil. Prefers a well-drained position; tolerates clay provided it is not waterlogged in winter. Overly fertile soil encourages lush, floppy growth. pH 6.0–7.5 is suitable. 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

Aster 'Hella Lacy' sits happiest at around 40-65% humidity and -25 to 30°C (-13 to 86°F). Open, airy sites with good air circulation are important to minimise powdery mildew. Avoid planting against solid boundaries or in humid, sheltered corners. 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 aster 'hella lacy' sparingly. Light feeding only: a balanced granular fertiliser in early spring on poorer soils. Excess nitrogen promotes the floppy, tall growth that requires staking and makes plants more disease-prone. 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 aster 'hella lacy' in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Powdery mildew — Major problem on tall New England asters; site in full sun with good airflow and consider preventative sulphur treatment in susceptible conditions.
  • Stem lodging — Tall stems may flop on windy or over-fertile sites; support with link stakes or carry out the Chelsea chop in late May to reduce final height.
  • Aphids — Common on new growth in spring; treat early before colonies establish.
  • Septoria leaf spot — Lower leaves develop brown spots and drop; increase air circulation and remove affected foliage.
  • Crown congestion — Vigorous clumps become woody in the centre; divide every 2-3 years in spring for best performance.

Companion plants

Aster 'Hella Lacy' pairs well with Helenium 'Moerheim Beauty', Rudbeckia laciniata 'Herbstsonne', Miscanthus sinensis, and Anemone x hybrida. 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

Divide established clumps in spring every 2-3 years, discarding the woody centre and replanting vigorous outer portions. Basal cuttings in spring also root readily and preserve cultivar characteristics. 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

Aster 'Hella Lacy' is mildly toxic to pets. Symphyotrichum novae-angliae 'Hella Lacy' is not individually listed by the ASPCA as toxic or non-toxic. The genus is not on the ASPCA confirmed non-toxic list, so as a precautionary measure it should be treated as mildly toxic and kept away from pets. 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.

Aster 'Hella Lacy' care — frequently asked questions

What is the common name for Symphyotrichum novae-angliae 'Hella Lacy'?

Symphyotrichum novae-angliae 'Hella Lacy' is most commonly called Aster 'Hella Lacy', but it is also known as Hella Lacy aster, New England aster, Michaelmas daisy. The names refer to the same species, so care instructions for Aster 'Hella Lacy' apply identically to anything sold as Hella Lacy aster.

How much light does aster 'hella lacy' need?

Aster 'Hella Lacy' grows best in direct sun (at least 4-6 hours). Full sun is preferred; 6+ hours daily supports upright growth and prolific flower production. Partial shade is tolerated but increases the risk of powdery mildew and reduces flower density.

How often should I water aster 'hella lacy'?

Water aster 'hella lacy' when the top 3-5 cm of soil is dry, roughly every 7-10 days. Fairly drought tolerant once established. Water at the base to avoid wetting the foliage, which is susceptible to fungal diseases. Keep consistently moist through the first growing season to establish a strong root system. 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 aster 'hella lacy' toxic to cats and dogs?

Aster 'Hella Lacy' is mildly toxic to pets. Symphyotrichum novae-angliae 'Hella Lacy' is not individually listed by the ASPCA as toxic or non-toxic. The genus is not on the ASPCA confirmed non-toxic list, so as a precautionary measure it should be treated as mildly toxic and kept away from pets.

What USDA hardiness zone does aster 'hella lacy' grow in?

Aster 'Hella Lacy' is rated for USDA zone 4-8 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Aster 'Hella Lacy' deep-dive guides

Every aspect of aster 'hella lacy' care, each with its own calibrated guide:

Featured in these plant shortlists

Aster 'Hella Lacy' 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

Aster 'Hella Lacy' is also known as Hella Lacy aster, New England aster, and Michaelmas daisy.