Flat-Leaf Parsley

Wormwood produces allelopathic compounds that inhibit growth of many plants including parsley and other herbs

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

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

Mugwort exhibits allelopathic properties that suppress parsley growth

Rue produces allelopathic compounds that inhibit growth of nearby herbs including parsley

Bronze fennel exhibits same allelopathic properties as regular fennel, inhibiting parsley

Lovage's large size and extensive root system compete heavily with smaller herbs like parsley

Angelica's large stature creates heavy shade and root competition for smaller herbs

Large elecampane plants compete heavily with smaller herbs for light and nutrients

Burdock's extensive taproot and large leaves compete intensely with parsley

Tall mullein creates dense shade that suppresses parsley growth

Epazote produces strong aromatic compounds that may inhibit nearby herbs

Milk thistle's large size and spiny nature compete with and crowd out smaller herbs

Horehound may produce compounds that inhibit growth of other herbs

Yellow dock's deep taproot and aggressive spreading habit compete with parsley

Sorrel's spreading root system can outcompete parsley for nutrients

St. Johns Wort may produce allelopathic compounds that inhibit herb growth