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Plant care

Coreopsis 'Jethro Tull' (Jethro Tull Tickseed) care

Coreopsis 'Jethro Tull'

Also called Jethro Tull Tickseed, Flute Coreopsis.

RHS H5USDA 4-9Pet-safeIndoor 30-45 cm tall

Watering rhythm

10-14days

When the top 4-5 cm of soil is dry, roughly every 10-14 days once established

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Light

Direct sun (at least 4-6 hours)

Soil

Lean to average, sharply well-drained soil

Humidity

30-60%

Temp

-10-30°C

Pet safety

Pet-safe

Mature size

30-45 cm tall

Care at a glance

Light

Most houseplants will scorch where coreopsis 'jethro tull' thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun (6+ hours) is necessary for strong flowering and to maintain the compact mounding habit. Insufficient light causes lax, spreading stems and reduced bloom. 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 4-5 cm of soil is dry, roughly every 10-14 days once established for coreopsis 'jethro tull', 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. Good drought tolerance once established. Avoid overwatering — this cultivar is susceptible to root and crown rot in wet soils. Water deeply but infrequently.

Soil and pot

Coreopsis 'Jethro Tull' grows best in lean to average, sharply well-drained soil. Thrives in lean conditions where drainage is excellent. Rich, moist soils are the main cause of failure. Sandy loam or gravel-amended soil is ideal. 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

Coreopsis 'Jethro Tull' sits happiest at around 30-60% humidity and -10-30°C (14-86°F). Prefers lower to moderate humidity. Wet, humid growing conditions increase the risk of crown rot. Plant in an open, airy position. 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 coreopsis 'jethro tull' sparingly. Minimal fertiliser required. A single light application of balanced granular fertiliser in spring is sufficient. Avoid any feeding that promotes lush, soft growth. 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 coreopsis 'jethro tull' in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Crown rot — The primary risk in heavy or wet soils. Plant in raised beds or sharply drained soil; never allow water to pool around the crown.
  • Short-lived in poorly drained sites — Can behave as a short-lived perennial if drainage is inadequate. Prioritise perfect drainage for long-term performance.
  • Aphids — Can appear on young growth in spring. Control with water jets or insecticidal soap.
  • Aster yellows — Phytoplasma disease causing distorted flowers. Remove and destroy affected plants; prevent by controlling leafhoppers.
  • Clump decline — Divide every 3-4 years in spring to maintain flowering vigour and prevent central die-out.

Companion plants

Coreopsis 'Jethro Tull' pairs well with Heuchera 'Caramel', Stachys byzantina, Lavandula angustifolia, and Festuca glauca. 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 clumps in spring every 3-4 years. Stem cuttings from basal shoots in spring also root reliably. Do not attempt to propagate true from seed as cultivar features will not be maintained. 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

Coreopsis 'Jethro Tull' is pet-safe. Coreopsis is listed as non-toxic to dogs and cats by the ASPCA. 'Jethro Tull' is a named cultivar within this non-toxic genus and is safe for 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.

Coreopsis 'Jethro Tull' care — frequently asked questions

What is the common name for Coreopsis 'Jethro Tull'?

Coreopsis 'Jethro Tull' is most commonly called Coreopsis 'Jethro Tull', but it is also known as Jethro Tull Tickseed, Flute Coreopsis. The names refer to the same species, so care instructions for Coreopsis 'Jethro Tull' apply identically to anything sold as Jethro Tull Tickseed.

How much light does coreopsis 'jethro tull' need?

Coreopsis 'Jethro Tull' grows best in direct sun (at least 4-6 hours). Full sun (6+ hours) is necessary for strong flowering and to maintain the compact mounding habit. Insufficient light causes lax, spreading stems and reduced bloom.

How often should I water coreopsis 'jethro tull'?

Water coreopsis 'jethro tull' when the top 4-5 cm of soil is dry, roughly every 10-14 days once established. Good drought tolerance once established. Avoid overwatering — this cultivar is susceptible to root and crown rot in wet soils. Water deeply but infrequently. 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 coreopsis 'jethro tull' toxic to cats and dogs?

Coreopsis 'Jethro Tull' is pet-safe. Coreopsis is listed as non-toxic to dogs and cats by the ASPCA. 'Jethro Tull' is a named cultivar within this non-toxic genus and is safe for pets.

What USDA hardiness zone does coreopsis 'jethro tull' grow in?

Coreopsis 'Jethro Tull' is rated for USDA zone 4-9 and RHS hardiness H5. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Coreopsis 'Jethro Tull' deep-dive guides

Every aspect of coreopsis 'jethro tull' care, each with its own calibrated guide:

Featured in these plant shortlists

Coreopsis 'Jethro Tull' 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

Coreopsis 'Jethro Tull' is also commonly called Jethro Tull Tickseed or Flute Coreopsis.