Triffid Weed is grown for its foliage and the structure it brings to a planting. It's hardy across USDA zones 10 through 12. Its spring flowers are a moderate draw for honeybees, native bees, and butterflies.
Zones
10-12
pH Range
4-7.5
Sun
Full Sun
Days to Maturity
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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 10 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
10-12
USDA PHZM 2023
Soil pH
4 - 7.5
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Frost Tolerance
60.8°F
plant_species_v5.csv
Frost-Free Days
0+
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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 (USDA PLANTS 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.
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.
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: ASPCA.)
Triffid Weed offers moderate value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Triffid Weed thrives
Triffid Weed is hardy across USDA zones 10 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.
Zones 10–12·Where Triffid Weed growsOpen map →
On USDA hardiness-zone overlap, Triffid Weed can grow in these states:
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.
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Frequently Asked Questions
Can I grow Triffid Weed in my zone?
Triffid Weed grows in USDA hardiness zones 10 through 12 (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 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 (USDA PLANTS Database). 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 (Xerces Society, Pollinator Partnership).
Is Triffid Weed safe for pets?
Triffid Weed is toxic to pets (dogs,cats) with mild severity. Keep it out of reach, and call ASPCA Animal Poison Control at (888) 426-4435 in an emergency.