Triffid Weed is grown for its foliage and the structure it brings to a planting. It's hardy across USDA zones 11 through 12. Its spring flowers are a moderate draw for honeybees, native bees, and butterflies.
Triffid Weed — the short answer
Triffid Weed: grown in zones 11–12, full sun, pH 4–7.5.
- USDA zones
- 11–12
- Hardy to zone 10b — Tropical Plants Database (Useful Tropical Plants) (-1 °C, converted). The source rates it slightly hardier than our range.
- Soil pH
- 4–7.5
- 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 Triffid Weed on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether triffid weed actually takes — and those shift from one yard to the next. Enter your address and we'll score triffid weed against your land's real conditions.
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What Triffid Weed is
Triffid Weed grows as a perennial. It blooms in spring.
How to grow Triffid Weed
Triffid Weed grows in USDA zones 11 through 12. Triffid Weed does best in full sun — at least 6 hours of direct sun a day — and soil from pH 4 to 7.5, on well-drained ground.
USDA Zones
11-12
Hardy to zone 10b: Tropical Plants Database (Useful Tropical Plants) lists -1 °C, converted to zone 10b, checked Oct 2026. The source rates it slightly hardier than our range. Ceiling: not verified.
Soil pH
4 - 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
60.8°F
Below this it stops growing rather than dies — a pace limit, not a survival limit.
FAO ECOCROP
Start the season right
Plant triffid weed in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Triffid Weed prefers pH 4 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 triffid weed to shape as it grows; the reward is its foliage and structure, not a harvest, so steady upkeep is the whole job.
Where Triffid Weed thrives
Triffid Weed is hardy across USDA zones 11 through 12. 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 11–12 spans average winter lows from 40°F to 60°F (USDA PHZM 2023). Across the 50 states and DC, that band covers none outright but splits 3 down the middle — and which side of that line your land sits on changes the answer.
Zones 11–12·Where Triffid Weed 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 Triffid Weed stands, state by state
Triffid Weed is rated for zones 11–12 — a cold floor USDA puts at 40 to 50°F. Across the 50 states and DC, 0 sit fully inside that band, the line runs through 3 more, and 48 sit outside it — and inside every split state, the same line runs on at county grain.
The line runs through
3 states
- California · zones 4b-11a
- Florida · zones 8b-12a
- Hawaii · zones 8b-13a
Triffid Weed’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 Triffid Weed
Growing guides for triffid weed
Good to know
One caution for pet owners — triffid weed is toxic to dogs and cats (mild severity). Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: Cornell Poisonous Plants Database.)
Triffid Weed offers moderate value to bees and other pollinators.
Your land is one point inside Triffid Weed'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 Triffid Weed will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether triffid weed 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 Triffid Weed
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•ASPCA
Frequently asked questions
Can I grow Triffid Weed in my zone?
Triffid Weed grows in USDA hardiness zones 11 through 12 (Hardy to zone 10b: Tropical Plants Database (Useful Tropical Plants) lists -1 °C, converted to zone 10b, checked Oct 2026. The source rates it slightly hardier than our range. Ceiling: not verified.). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
When should you plant Triffid Weed?
Most growers plant triffid weed after the last spring frost, once the soil has warmed. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Triffid Weed need?
Triffid Weed 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 Triffid Weed need?
Triffid Weed prefers soil pH 4 to 7.5, on well-drained ground (FAO ECOCROP). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Triffid Weed attract pollinators?
Yes — triffid weed's flowers are a solid nectar source for honeybees, native bees, and butterflies.
Is Triffid Weed safe for pets?
Triffid Weed is toxic to dogs and cats with mild severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency. (Source: Cornell Poisonous Plants Database.)
Keep exploring Triffid Weed
Triffid Weed state by state
Every state triffid weed's zone reaches — 0 link straight to that state's triffid weed growing page; the rest open the state's full growing guide.