Siver Ironbark is grown for its foliage and the structure it brings to a planting. It's hardy across USDA zones 9 through 11. Its spring flowers are a real draw for honeybees and native bees. It roots deep, which helps it reach moisture in a dry spell and open up tight soil as it establishes.
Siver Ironbark — the short answer
Siver Ironbark: grown in zones 9–11, full sun, pH 5.5–7.5.
- USDA zones
- 9–11
- Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
- Soil pH
- 5.5–7.5
- FAO ECOCROP
- Sun
- Full Sun
- Growable Ground Plant Database
- Frost-kill temp (growing season)
- 30.2°F
- FAO ECOCROP
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 Siver Ironbark on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether siver ironbark actually takes — and those shift from one yard to the next. Enter your address and we'll score siver ironbark against your land's real conditions.
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What Siver Ironbark is
Siver Ironbark grows as a perennial. It blooms in spring.
How to grow Siver Ironbark
Siver Ironbark grows in USDA zones 9 through 11. Siver Ironbark 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 a growing season of at least 150 frost-free days, which is why climate matters as much as soil.
USDA Zones
9-11
USDA PHZM 2023
Soil pH
5.5 - 7.5
FAO ECOCROP
Sun
Full Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Frost Kill Temperature
30.2°F
Where cold starts killing growing tissue. Not a winter-survival floor — a dormant perennial takes far colder, which its hardiness zone answers.
FAO ECOCROP
Minimum Growing Temperature
39.2°F
Below this it stops growing rather than dies — a pace limit, not a survival limit.
FAO ECOCROP
Frost-Free Days
150+
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 siver ironbark in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Siver Ironbark prefers pH 5.5 to 7.5 (FAO ECOCROP). 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.
Keep it in good form
Prune siver ironbark to shape as it grows; the reward is its foliage and structure, not a harvest, so steady upkeep is the whole job.
Where Siver Ironbark thrives
Siver Ironbark is hardy across USDA zones 9 through 11. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
A USDA zone is a 10°F band of average annual extreme winter minimum, so zones 9–11 spans average winter lows from 20°F to 50°F (USDA PHZM 2023). Across the 50 states and DC, that band covers none outright but splits 17 down the middle — and which side of that line your land sits on changes the answer.
Zones 9–11·Where Siver Ironbark growsOpen map →
This map is derived from the USDA ARS / PRISM Plant Hardiness Zone Map (2023) and is not the official USDA Plant Hardiness Zone Map.
Where Siver Ironbark stands, state by state
Siver Ironbark is rated for zones 9–11 — a cold floor USDA puts at 20 to 30°F. Across the 50 states and DC, 0 sit fully inside that band, the line runs through 17 more, and 34 sit outside it — and inside every split state, the same line runs on at county grain.
The line runs through
17 states
- Alaska · zones 1a-9a
- California · zones 4b-11a
- Nevada · zones 4a-10a
3 of 17 shown
Siver Ironbark’s band covers part of each of these states — which side of the line your county sits on changes the answer, and each state page draws it.
State zone extents: USDA Plant Hardiness Zone Map (PHZM) 2023. A zone is a 10°F band of average annual extreme minimum temperature, so a state that splits the band contains the boundary — its own page draws the county line, and a parcel report resolves which side your land sits on.
What grows around Siver Ironbark
Growing guides for siver ironbark
In rotation planning, siver ironbark 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)
Good to know
One caution for pet owners — siver ironbark is toxic to dogs and cats (moderate severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Siver Ironbark is a standout pollinator plant — high value to bees and other pollinators.
Your land is one point inside Siver Ironbark'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 Siver Ironbark will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether siver ironbark 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.
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How we know this about Siver Ironbark
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 Siver Ironbark in my zone?
Siver Ironbark grows in USDA hardiness zones 9 through 11 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
When should you plant Siver Ironbark?
Most growers plant siver ironbark after the last spring frost, once the soil has warmed, leaving enough of the season for its 150-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 Siver Ironbark need?
Siver Ironbark 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 Siver Ironbark need?
Siver Ironbark prefers soil pH 5.5 to 7.5, on well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Siver Ironbark attract pollinators?
Yes — siver ironbark's flowers are a strong nectar and pollen source for honeybees and native bees.
Is Siver Ironbark safe for pets?
Siver Ironbark is toxic to pets (dogs,cats) with moderate severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: ASPCA.)
Keep exploring Siver Ironbark
Siver Ironbark state by state
Every state siver ironbark's zone reaches — 4 link straight to that state's siver ironbark growing page; the rest open the state's full growing guide.