Coreopsis 'Zagreb' (Zagreb tickseed) care

Light

Coreopsis 'Zagreb' needs sun on the leaves, not just bright ambient room light. Full sun gives the densest mounds and heaviest flowering; in shade it grows lax, blooms sparsely and is prone to mildew. 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 coreopsis 'zagreb' water to establish, then only in extended drought; drought-tolerant once settled. 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. Let the soil dry between waterings. Established plants are very drought-hardy and dislike soggy ground, which causes root rot.

Soil and pot

Coreopsis 'Zagreb' grows best in average, well-drained soil; tolerates lean, sandy and dry conditions. Undemanding and adaptable, but needs good drainage. Avoid rich, heavy, or constantly wet soils; lean ground produces sturdier, more floriferous plants. 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 'Zagreb' sits happiest at around Ambient outdoor humidity and -34 to 32°C (-29 to 90°F). An outdoor perennial unaffected by humidity directly, though poor airflow in damp sites can encourage occasional powdery mildew. 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 'zagreb' sparingly. Very low feeding needs. A light compost mulch in spring is enough; rich fertiliser causes floppy, leafy growth at the expense of flowers. Lean soil keeps it compact and free-flowering. 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 'zagreb' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Root rot in wet soil — Heavy, soggy ground rots the crown. Plant in well-drained soil and avoid overwatering, especially over winter.
• Reduced bloom after first flush — Flowering can slow midseason. Shear the whole plant back lightly to spur a strong second wave of blooms.
• Spreading by rhizomes — Can creep beyond its spot in good soil. Divide every few years and pull stray shoots to keep the clump tidy.
• Powdery mildew — Occasional in humid, crowded plantings. Improve spacing and airflow and avoid overhead watering.

Propagation

Divide clumps in spring or autumn every 2-3 years; lift rhizomatous offsets to make new plants. As a cultivar it is propagated vegetatively rather than from seed to stay 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

Coreopsis 'Zagreb' is pet-safe. ASPCA-listed as non-toxic to cats and dogs; Coreopsis (tickseed) appears on the ASPCA non-toxic plant list. Ingesting large amounts of any plant may still cause mild, temporary stomach upset. 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 'Zagreb' deep-dive guides

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

• Coreopsis 'Zagreb' watering schedule
• Coreopsis 'Zagreb' light requirements
• Best soil mix for coreopsis 'zagreb'
• Coreopsis 'Zagreb' fertilizing guide
• When to repot coreopsis 'zagreb'
• How to propagate coreopsis 'zagreb'
• Coreopsis 'Zagreb' growth rate & size
• Coreopsis 'Zagreb' cold hardiness
• Coreopsis 'Zagreb' temperature & humidity
• Is coreopsis 'zagreb' toxic to cats & dogs?
• Is coreopsis 'zagreb' toxic to cats?
• Is coreopsis 'zagreb' toxic to dogs?
• Getting coreopsis 'zagreb' to bloom

Featured in these plant shortlists

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

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• Best drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best pet-safe low-maintenance plants — Non-toxic to cats and dogs and forgiving of forgotten watering — the easiest safe choices for a busy pet household.
• Best pet-safe flowering plants — Flowering houseplants the ASPCA lists as non-toxic to cats and dogs — colour and blooms in a pet home, without the worry.
• Best pet-safe plants for bright light — Non-toxic to cats and dogs and happy in a bright, sunny spot — safe plants for your best-lit windowsill.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Coreopsis 'Zagreb' is also commonly called Zagreb tickseed.

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