Douglas' Onion

Scientific Name: Allium douglasii Hook.

Classification: Plantae/ Tracheobionta / Spermatophyta / Magnoliophyta / Liliopsida / Liliidae / Liliales / Liliaceae / Allium L./ Allium douglasii Hook.

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General Information
Usda SymbolALDO
GroupMonocot
Life CyclePerennial
Growth HabitsForb/herb
Native LocationsALDO

Plant Guide

Use soil moisture sensors to measure the soil moisture of Douglas' Onion.

Plant Traits

Growth Requirements

Temperature, Minimum (°F)-28
Adapted to Coarse Textured SoilsYes
Adapted to Fine Textured SoilsYes
Adapted to Medium Textured SoilsYes
Anaerobic ToleranceLow
CaCO3 ToleranceMedium
Cold Stratification RequiredNo
Drought ToleranceMedium
Fertility RequirementLow
Fire ToleranceHigh
Frost Free Days, Minimum100
Hedge ToleranceNone
Moisture UseMedium
pH, Maximum7.8
pH, Minimum6.0
Planting Density per Acre, Maxim11000
Planting Density per Acre, Minim4800
Precipitation, Maximum16
Precipitation, Minimum8
Root Depth, Minimum (inches)8
Salinity ToleranceNone
Shade ToleranceIntolerant


Morphology/Physiology

After Harvest Regrowth RateSlow
ToxicityNone
Resprout AbilityNo
Shape and OrientationErect
Active Growth PeriodSpring
BloatNone
C:N RatioMedium
Coppice PotentialNo
Fall ConspicuousNo
Fire ResistantNo
Flower ColorPurple
Flower ConspicuousYes
Foliage ColorGreen
Foliage Porosity SummerPorous
Foliage Porosity WinterPorous
Fruit/Seed ColorBrown
Nitrogen FixationNone
Low Growing GrassNo
LifespanShort
Leaf RetentionNo
Known AllelopathNo
Height, Mature (feet)0.9
Growth RateRapid
Growth FormSingle Crown
Fruit/Seed ConspicuousYes
Foliage TextureMedium


Reproduction

Vegetative Spread RateSlow
Small GrainNo
Seedling VigorMedium
Seed Spread RateSlow
Fruit/Seed Period EndSummer
Propagated by TubersNo
Propagated by SprigsNo
Propagated by SodNo
Propagated by SeedYes
Propagated by CuttingsNo
Propagated by ContainerNo
Propagated by BulbYes
Propagated by Bare RootNo
Fruit/Seed PersistenceNo
Fruit/Seed Period BeginSpring
Fruit/Seed AbundanceLow
Commercial AvailabilityNo Known Source
Bloom PeriodLate Spring
Propagated by CormNo


Suitability/Use

Veneer ProductNo
Pulpwood ProductNo
Protein PotentialLow
Post ProductNo
Palatable HumanYes
Palatable Graze AnimalHigh
Palatable Browse AnimalHigh
Nursery Stock ProductNo
Naval Store ProductNo
Lumber ProductNo
Fodder ProductYes
Christmas Tree ProductNo
Berry/Nut/Seed ProductNo
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