Zinnia is an annual grown for its blooms, which open from spring through fall. Notably, it shrugs off deer and grows just as well in a container as in the ground. Its flowers are a real draw for honeybees, native bees, butterflies, and hummingbirds.
Zinnia — the short answer
Zinnia: full sun, pH 5.5–7.5, about 65 days to maturity.
- Soil pH
- 5.5–7.5
- Growable Ground Plant Database
- Sun
- Full Sun
- Growable Ground Plant Database
- Days to Maturity
- 65 days
- Growable Ground Plant Database
- Frost-kill temperature
- 32°F
- Growable Ground Plant Database
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — each tile names its own row's source, because per-field provenance varies.
Score Zinnia on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether zinnia actually takes — and those shift from one yard to the next. Enter your address and we'll score zinnia against your land's real conditions.
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
What Zinnia is
Zinnia grows as an annual and reaches around three feet at maturity. It blooms from spring through fall. It's also deer-resistant and well suited to containers.
How to grow Zinnia
Zinnia does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.5 to 7.5, on well-drained ground. It needs around 800 growing degree days to mature and a growing season of at least 60 frost-free days, which is why climate matters as much as soil.
USDA Zones
Data pending
Soil pH
5.5 - 7.5
Growable Ground Plant Database
Sun
Full Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Frost Kill Temperature
32°F
Where cold starts killing growing tissue. Not a winter-survival floor — a dormant perennial takes far colder, which its hardiness zone answers.
Growable Ground Plant Database
Days to Maturity
65 days
Growable Ground plant catalog
GDD Required
800+
Growing degree-days of accumulated warmth it needs to mature — humid summers reach this faster than cool coastal ones.
Growable Ground plant catalog
Mature Height
3 ft
Growable Ground plant catalog
Frost-Free Days
60+
The frost-free stretch it needs start to finish — short-season areas may need an indoor head start.
Growable Ground plant catalog
Start the season right
Plant zinnia in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Zinnia prefers pH 5.5 to 7.5 (Growable Ground Plant Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at its peak
Cut zinnia blooms in the cool of the morning, just as they open, for the longest display.
Where Zinnia thrives
Whether zinnia thrives on a given site comes down to its soil pH, drainage, sun, and frost dates — the conditions that vary parcel to parcel.
What grows around Zinnia
Growing guides for zinnia
In rotation planning, zinnia counts as a Other — beds recover best when other crops don’t follow each other in the same spot year over year. (Growable Ground derivation — crop-rotation group from botanical family)
Related plants in annual flower
Good to know
Good news for pet owners — zinnia isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Zinnia is a standout pollinator plant — high value to bees and other pollinators. (Source: Xerces Society.)
Your land is one point inside Zinnia's range
This page resolves to the species. Your state page draws the county line, and a report reads the parcel — the soil pH, drainage, sun, and frost dates on your exact ground, which no species average can see.
See if Zinnia will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether zinnia actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources analyzed in seconds
How we know this about Zinnia
The figures above are cited per row, not per site: the pH band names this plant’s own source column, the three temperature figures each carry their own, and days-to-maturity cites the publication that actually lists it. All of it comes from the Growable Ground Plant Database — a compilation over FAO ECOCROP, USDA PLANTS, and university Extension sources, published openly with per-field provenance.
Grounded inUSDA PLANTS Database•USDA PHZM•ASPCA
Frequently asked questions
Can I grow Zinnia in my zone?
Zone data for zinnia is being finalized. A Growable Ground report checks your parcel's full suitability against federal soil, climate, and zone data.
When should you plant Zinnia?
Most growers plant zinnia after the last spring frost, once the soil has warmed, leaving enough of the season for its 60-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Zinnia need?
Zinnia needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Zinnia need?
Zinnia prefers soil pH 5.5 to 7.5, on well-drained ground (Growable Ground Plant Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Zinnia attract pollinators?
Yes — zinnia's flowers are a strong nectar and pollen source for honeybees, native bees, butterflies, and hummingbirds. (Source: Xerces Society.)
Is Zinnia safe for pets?
Zinnia is not known to be toxic to dogs or cats based on available data. Always supervise pets around new plantings. (Source: ASPCA.)