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Plant care

Echinacea 'Tomato Soup' (Tomato Soup coneflower) care

Echinacea 'Tomato Soup'

Also called Tomato Soup coneflower, red coneflower.

RHS H7USDA 4–9Pet-safeIndoor 60–75 cm tall

Watering rhythm

10-14days

Once or twice a week during the first growing season; every 10–14 days once established

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Light

Direct sun (at least 4-6 hours)

Soil

Well-drained loam or gritty loam

Humidity

30–60%

Temp

-20 to 32°C

Pet safety

Pet-safe

Mature size

60–75 cm tall

Care at a glance

Light

Echinacea 'Tomato Soup' needs sun on the leaves, not just bright ambient room light. Needs at least 6 hours of full sun per day to achieve maximum flower colour and stem strength. Red pigmentation may fade in partial shade and plants become less floriferous. 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 echinacea 'tomato soup' once or twice a week during the first growing season; every 10–14 days 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. Deep watering at the root zone encourages drought resilience. Once established, this cultivar tolerates dry periods well. Mulching around the base helps retain soil moisture and regulate root temperature.

Soil and pot

Echinacea 'Tomato Soup' grows best in well-drained loam or gritty loam. Thrives in average to lean, free-draining soils. Rich, moisture-retentive soils produce more foliage and fewer flowers. Ensure good drainage to prevent crown and root rot during winter wet. 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

Echinacea 'Tomato Soup' sits happiest at around 30–60% humidity and -20 to 32°C (-4 to 90°F). Performs well across a wide range of garden humidity levels. Good airflow around the planting helps to reduce powdery mildew, which can affect hybrid Echinacea in humid climates. 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 echinacea 'tomato soup' sparingly. Apply a balanced granular fertiliser (such as 10-10-10) once in early spring. Avoid high-nitrogen feeding which encourages leafy growth at the expense of the vivid blooms this cultivar is known for. 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 echinacea 'tomato soup' in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Powdery mildew — Can develop in late summer, especially with dry roots and humid air. Improve spacing for airflow and water at the base.
  • Aster yellows — Causes petal distortion and green coloration. Remove and bin infected plants immediately.
  • Colour fading — Intense red fades faster in full heat; deadheading spent flowers encourages fresh, more vibrant blooms.
  • Root rot — Caused by poorly drained or waterlogged soils. Always plant in well-drained locations or raised beds.
  • Rabbits — Young shoots are palatable to rabbits. Protect with wire cloches in spring if rabbits are present.

Companion plants

Echinacea 'Tomato Soup' pairs well with Rudbeckia hirta 'Indian Summer', Helenium 'Moerheim Beauty', Sanguisorba officinalis, and Miscanthus sinensis 'Gracillimus'. 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 division in spring, separating vigorous outer sections of the crown. Seed-grown plants will not reproduce the red colour reliably; clump division is the recommended method. 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

Echinacea 'Tomato Soup' is pet-safe. Echinacea is classified as non-toxic to cats and dogs by the ASPCA. 'Tomato Soup' belongs to the same genus and is considered safe in gardens with 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.

Echinacea 'Tomato Soup' care — frequently asked questions

What is the common name for Echinacea 'Tomato Soup'?

Echinacea 'Tomato Soup' is most commonly called Echinacea 'Tomato Soup', but it is also known as Tomato Soup coneflower, red coneflower. The names refer to the same species, so care instructions for Echinacea 'Tomato Soup' apply identically to anything sold as Tomato Soup coneflower.

How much light does echinacea 'tomato soup' need?

Echinacea 'Tomato Soup' grows best in direct sun (at least 4-6 hours). Needs at least 6 hours of full sun per day to achieve maximum flower colour and stem strength. Red pigmentation may fade in partial shade and plants become less floriferous.

How often should I water echinacea 'tomato soup'?

Water echinacea 'tomato soup' once or twice a week during the first growing season; every 10–14 days once established. Deep watering at the root zone encourages drought resilience. Once established, this cultivar tolerates dry periods well. Mulching around the base helps retain soil moisture and regulate root temperature. 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 echinacea 'tomato soup' toxic to cats and dogs?

Echinacea 'Tomato Soup' is pet-safe. Echinacea is classified as non-toxic to cats and dogs by the ASPCA. 'Tomato Soup' belongs to the same genus and is considered safe in gardens with pets.

What USDA hardiness zone does echinacea 'tomato soup' grow in?

Echinacea 'Tomato Soup' is rated for USDA zone 4–9 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Echinacea 'Tomato Soup' deep-dive guides

Every aspect of echinacea 'tomato soup' care, each with its own calibrated guide:

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Echinacea 'Tomato Soup' qualifies for 10 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Echinacea 'Tomato Soup' is also commonly called Tomato Soup coneflower or red coneflower.