Northern St. Johnswort

Scientific Name: Hypericum boreale (Britton) E.P. Bicknell


Classification: Plantae/ Tracheobionta / Spermatophyta / Magnoliophyta / Magnoliopsida / Dilleniidae / Theales / Clusiaceae / Guttiferae / Hypericum L./ Hypericum boreale (Britton) E.P. Bicknell

Northern St. Johnswort
General Information
Usda SymbolHYBO2
GroupDicot
Life CyclePerennial
Growth HabitsForb/herb
Native LocationsHYBO2

Plant Guide

Use a soil moisture meter to monitor the soil moisture where Northern St. Johnswort is planted.

Plant Traits

Growth Requirements

Temperature, Minimum (°F)-33
Adapted to Coarse Textured SoilsYes
Adapted to Fine Textured SoilsNo
Adapted to Medium Textured SoilsYes
Anaerobic ToleranceHigh
CaCO3 ToleranceLow
Cold Stratification RequiredYes
Drought ToleranceNone
Fertility RequirementMedium
Fire ToleranceMedium
Frost Free Days, Minimum90
Hedge ToleranceNone
Moisture UseHigh
pH, Maximum6.0
pH, Minimum4.4
Planting Density per Acre, Maxim1700
Planting Density per Acre, Minim1200
Precipitation, Maximum55
Precipitation, Minimum30
Root Depth, Minimum (inches)8
Salinity ToleranceNone
Shade ToleranceIntermediate


Morphology/Physiology

After Harvest Regrowth RateSlow
ToxicityNone
Resprout AbilityNo
Shape and OrientationDecumbent
Active Growth PeriodSummer
BloatNone
C:N RatioMedium
Coppice PotentialNo
Fall ConspicuousNo
Fire ResistantNo
Flower ColorYellow
Flower ConspicuousYes
Foliage ColorGreen
Foliage Porosity SummerPorous
Foliage Porosity WinterPorous
Fruit/Seed ColorBrown
Nitrogen FixationNone
Low Growing GrassNo
LifespanModerate
Leaf RetentionNo
Known AllelopathNo
Height, Mature (feet)0.8
Growth RateModerate
Growth FormStoloniferous
Fruit/Seed ConspicuousNo
Foliage TextureCoarse


Reproduction

Vegetative Spread RateSlow
Small GrainNo
Fruit/Seed AbundanceHigh
Seedling VigorMedium
Seed Spread RateSlow
Propagated by TubersNo
Propagated by SprigsYes
Propagated by SodNo
Propagated by SeedNo
Propagated by CuttingsNo
Propagated by ContainerNo
Propagated by BulbNo
Propagated by Bare RootNo
Fruit/Seed PersistenceNo
Fruit/Seed Period EndFall
Fruit/Seed Period BeginSummer
Commercial AvailabilityNo Known Source
Bloom PeriodEarly Summer
Propagated by CormNo


Suitability/Use

Veneer ProductNo
Pulpwood ProductNo
Post ProductNo
Palatable HumanNo
Nursery Stock ProductNo
Naval Store ProductNo
Lumber ProductNo
Fodder ProductNo
Christmas Tree ProductNo
Berry/Nut/Seed ProductNo

Northern St. Johnswort

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