Good King Henry is an annual multi-use herb, valued for its many uses in the garden. Notably, it grows just as well in a container as in the ground.
Zones
Data not available
pH Range
5.5-8
Sun
Full Sun
Days to Maturity
60
Score Good King Henry on your exact land.
Zone averages can't see the slope, soil, frost, and sun that decide whether good king henry actually takes — and those shift from one yard to the next. Enter your address and we'll score good king henry against your land's real conditions.
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What Good King Henry is
Good King Henry grows as an annual and reaches around a foot at maturity. It blooms green in summer. It's also well suited to containers.
How to grow Good King Henry
Good King Henry is ready to harvest about 60 days after planting. Good King Henry does best in full sun — at least 6 hours of direct sun a day — and soil from pH 5.5 to 8, on well-drained ground. It needs around 700 growing degree days to mature, which is why climate matters as much as soil.
USDA Zones
Data not available
USDA PHZM 2023
Soil pH
5.5 - 8
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Days to Maturity
60 days
plant_species_v5.csv
GDD Required
700+
plant_species_v5.csv
Mature Height
1 ft
plant_species_v5.csv
Frost-Free Days
0+
plant_species_v5.csv
Start the season right
Plant good king henry in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Good King Henry prefers pH 5.5 to 8 (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.
Harvest at its peak
Harvest the part you grow good king henry for — flower, leaf, or root — at its seasonal peak.
Good to know
One caution for pet owners — good king henry 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.)
Good King Henry isn't classified as a notable pollinator plant in our data — pair it with high-value bloomers nearby to feed bees.
Where Good King Henry thrives
Whether good king henry thrives on a given site comes down to its soil pH, drainage, sun, and frost dates — the conditions that vary parcel to parcel.
See if Good King Henry will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether good king henry 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 Good King Henry in my zone?
Zone data for good king henry is being finalized. A Growable Ground report checks your parcel's full suitability against federal soil, climate, and zone data.
How long does Good King Henry take to grow?
Good King Henry is ready to harvest about 60 days after planting (University Extension production guides). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Good King Henry?
Most growers plant good king henry 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 Good King Henry need?
Good King Henry 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 Good King Henry need?
Good King Henry prefers soil pH 5.5 to 8, on well-drained ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Good King Henry attract pollinators?
Good King Henry isn't classified as a notable pollinator plant in our data. Pairing it with high-value bloomers nearby keeps bees and butterflies fed.
Is Good King Henry safe for pets?
Good King Henry 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.