What Grows Under a Walnut Tree? (And Why Most Plants Don’t)

Walnuts are unique among most broad-leaf trees in that they secrete a chemical through their roots that can inhibit the growth of certain plants.

Elizabeth Steele dives into how this chemical process works and which plants can thrive in this micro-ecosystem.

What grows under Walnut Trees

• River Oats (Chasmanthium latifolium)
• Wild Ryes (Elymus sp.)
• Bottlebrush Grass (Elymus hystrix)
• Coreopsis, Tickseed (Coreopsis lanceolata)
• Beardtongue, White (Penstemon digitalis)
• Black-eyed Susan, Common (Rudbeckia hirta)
• Brown-eyed Susan (Rudbeckia triloba)
• Coneflower, Gray-headed (Ratibida pinnata)
• Coneflower, Purple (Echinacea purpurea)
• Sunflower, Ox-eye (Heliopsis helianthoides)
• Poverty Grass (Danthonia spicata)
• Tick Trefoil, Showy (Desmodium canadense)
• Lespedeza, Slender (Lespedeza virginica)
• Aster, Aromatic (Symphyotrichum oblongifolium)
• Goldenrod, Gray (Solidago nemoralis)
• Jacob’s Ladder (Polemonium reptans)
• Violet Birdsfoot (Viola pedata)
• Bluebell, Virginia (Mertinsia virginica)

Observed Growing Under Walnut Trees by Others

• Panic Grass, Deer Tongue (Panicum clandestinum)
• Mountain Mints (Pycanthemum sp.)
• Sunflower, Tickseed (Bidens aristosa)
• Sunflower, Ashy (Helianthus mollis)
• Ironweed, Western (Vernonia baldwinii)
• Lobelia, Blue (Lobelia siphilitica)
• Bergamot, Wild (Monarda fistulosa)
• Spiderwort, Ohio (Tradescantia ohiensis)
• Meadow Rue, Waxy (Thalictrum revolutum)

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