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Sweet Fennel

Foeniculum vulgare, Apiaceae

Zones
6a10b
Layer
Herbaceous
Lifespan
Perennial
Growth
Fast

Guild Roles

Pollinator AttractorDynamic AccumulatorBeneficial Insect HabitatProducer

Growing Conditions

Sun

Full Sun (optimal)

Water

LowLowLow

Soil pH

5.57

Tolerances

Drought
Frost
Heat
Pest Resistance
Disease Resist.

Companion Plants

Antagonistic Plants

TomatoSolanum lycopersicum

Fennel root exudates inhibit tomato growth

PotatoSolanum tuberosum

Fennel allelopathy inhibits potato growth

CucumberCucumis sativus

Fennel root exudates stunt cucumber growth

English PeaPisum sativum

Fennel root exudates inhibit pea growth

French TarragonArtemisia dracunculus var. sativa

Fennel's allelopathic compounds can inhibit French tarragon growth and development

Flat-Leaf ParsleyPetroselinum crispum var. neapolitanum

Fennel's allelopathic compounds can significantly reduce parsley growth and vigor

SpinachSpinacia oleracea

Bronze fennel produces allelopathic compounds that inhibit growth of many vegetables including spinach

ChervilAnthriscus cerefolium

Fennel's allelopathic properties particularly affect delicate herbs like chervil

WormwoodArtemisia absinthium

Both wormwood and fennel produce strong allelopathic compounds that may interfere with each other

Common RueRuta graveolens

Rue and fennel both produce allelopathic compounds that can inhibit each other's growth

Winter SavorySatureja montana

Winter savory growth is suppressed by fennel's chemical inhibition

Common WheatTriticum aestivum

Fennel produces allelopathic compounds that can inhibit cereal grain growth

Canna LilyCanna × generalis

Fennel allelopathic effects may negatively impact ornamental plants like canna lilies

Fragrant HostaHosta plantaginea

Fennel allelopathic compounds can negatively affect hosta growth and development

CilantroCoriandrum sativum

Fennel produces allelopathic compounds that can inhibit the growth of cilantro and many other plants

DillAnethum graveolens

Fennel's allelopathic properties and aggressive root system can negatively impact dill growth

Garden CressLepidium sativum

Fennel's allelopathic effects negatively impact germination and growth of garden cress

Uses

Functions

Nutrient AccumulationFood

Edible Parts

LeavesSeedsRoots

Common Questions

What zones does Sweet Fennel grow in?

Sweet Fennel grows in USDA hardiness zones 6a through 10b.

What are good companion plants for Sweet Fennel?

Good companions for Sweet Fennel include Garden Dahlia, Curry Plant, Garden Tulip, Stinging Nettle, Flaming Katy.

Design guilds with Sweet Fennel and see companion relationships visually.

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