How to Grow Zinnia (Zinnia elegans)

Zinnias run the best deal in flowers: every stem you cut for the table is repaid with interest, so the vase and the bed both stay full from summer until frost. Colors come loud and unapologetic — the highest flowers-per-effort plant you can grow.

Butterflies treat a zinnia patch like a landing strip, and bees keep it busy underneath them. Direct-sown after frost, it goes from seed packet to bouquet in one summer with almost no fuss. Claim a sunny strip and keep the scissors handy.

Where to buy zinnia — 6 nurseries compared

Full Sun
Moderate water
Very Fast growth
Attracts butterflies
Attracts bees
None winter chill

Zinnia — a print from the Plant Library collection

From the print shop

Growing zinnia? Hang it.

Our Plant Library collection carries zinnia — Zinnia elegans, print Nº 525, “Zinnia.”

526 designsfrom $12.99white or black backgroundmatte poster, unframed

Shop Plant Library botanical prints →

✓

Will it fruit where you are?

Enter your ZIP — we look up your USDA hardiness zone (2023 map) and check it against what zinnia actually needs.

Life cycleAnnual

Winter chillNone

Zinnia · Common problems

Common zinnia problems

Pests, diseases and weather to keep an eye on.

Pests

2 problems on file

Japanese Beetle (minor)
Cyclamen & Broad Mites

Diseases

4 problems on file

Zinnia · Growing & propagation

Growing zinnia

Light, water, soil, propagation and the season’s jobs.

What it needsThe details

Light: Full Sun
Water: Moderate. Water the soil
Wet leaves mildew
Soil: Average, Well-drained · pH 5.5 - 7.5
Fertilizer: Light monthly feed for nonstop bloom.
Pruning: None (annual)
Deadhead or cut constantly; "cut deep" (long stems) forces branching.
Spacing: 9-12 inches

How to plant & propagate zinnia

Maturity: 60-70 days
From seed: Direct-sow after frost, or start 4 wks early; loves heat
Propagate: From seed

Zinnia · Seasonal care & spray guidance

The zinnia growing playbook

Field-tested instructions for every job zinnia asks of you, compiled from university extension guidance — in the order the season brings them.

When to spray zinnia

Growing season. Mildew-resistant series ('Benary's', 'Profusion') + soil-level watering beats spraying.

Timing only — the label is the law

This is when to watch and when a treatment is worth considering, not a recommendation to apply any product. Read and follow the product label before you spray — under federal law the label is the legal instruction, and using a pesticide against it is illegal.

Check the pre-harvest interval. Every product that’s cleared for an edible crop sets a minimum number of days between spraying and picking. Find it on the label before you spray anything you intend to eat.
Check the re-entry interval before you or anyone else works in the treated area again, and use the protective equipment the label names.
Confirm the product is registered for zinnia in your state. A product legal on one crop is not legal on all of them, and state registrations differ — your state pesticide agency or local extension office can confirm both.
Rates and mixing instructions come from the label, never from us. We don’t publish them because they differ by product and formulation.

Zinnia · Calculators & field guides

A little help in the garden.

Calculators for the figures. Field guides for the hands-on work.

6 min

How to dry flowers for bouquets

5 min

How to save zinnia seeds

Zinnia · Yearly calendar

The zinnia year, month by month

What zinnia asks for, month by month.

Jan

No calendar activity is listed for this month.

MonthJanFebMarAprMayJunJulAugSepOctNovDec

Bloom

Harvest

BloomJune

HarvestJune to August

What each band means

Bloom — flowers open — pollinators working, frost on blossoms is the danger.
Harvest — picking time — check ripeness every few days.

These are the species' typical months — expect them a few weeks earlier in warm zones and later in cold ones. Watch the plant, not just the calendar.

Zinnia · Ecology & uses

Ecology & uses

What it does for the garden, and what it is grown for.

Zinnia elegans

Zinnia in the garden system

Herbaceous layer annual
Nectary/insectary

Attracts: Butterflies, Bees
Moisture: Facultative / average
Deer: Browsed
Protect young plants
Origin: Introduced

What zinnia is grown for

✓ Commonly eaten

Use: Cut flowers
Use: Pollinators
Use: Butterflies

Harvesting & storing zinnia

Cut all summer — cutting MAKES more blooms. About 60-70 days from planting.

Edibility, identification, and traditional-use notes here are general reference — not medical or veterinary advice, and not a claim that any plant treats or prevents anything. Medicinal ratings record how strongly a plant features in herbal tradition, nothing more. Never eat or dose a plant you have not positively identified. More on how to use this library.

Zinnia · Varieties & cultivars

Choosing a zinnia variety

Match the plant to your climate, season and available space.

'Benary's Giant', 'Queen Lime', 'Profusion'

Sources & plant identity

Know what you’re growing.
See where the knowledge comes from.

The plant, at a glance.

Botanical name: Zinnia elegans
Plant family: Asteraceae
Growth habit: Annual
Origin: Introduced
USDA plant symbol: ZIEL
Invasive risk: Low

Every garden is different.

Hardiness, size and timing vary with your cultivar, soil and climate.

Rooted in research.

University extension research, brought together with hands-on growing experience at Story Thyme Farms.

Explore the source library

Questions

Zinnia questions, answered straight.

Is zinnia safe for kids and pets?

Zinnia is commonly eaten and isn't considered toxic, but "commonly eaten" isn't a guarantee for any particular person or animal — allergies, quantity, and which part you eat all matter. Never eat a plant you haven't positively identified, and check with a vet before letting pets or livestock graze anything new.

When do you harvest zinnia?

Cut all summer — cutting MAKES more blooms. From planting, expect about 60-70 days to maturity.

How do you propagate zinnia?

From seed.

Elsewhere

Where zinnia sits in the library.

Grows in the same world