Trees and Shrubs

 

plants seen growing near or under a black walnut tree

Black walnut trees (Juglans nigra) have a substance in their roots (juglone) which can be toxic to many plants. The ones cited here may be tolerant, but there are no guarantees of this.

 

Trees and shrubs

  • Japanese Maples, Acer palmatum and its cultivars
  • Eastern Redbud, Cercis canadensis
  • Canadian Hemlock, Tsuga canadensis
  • Weeping Forsythia, Forsythia suspensa
  • Koreanspice Viburnum, Viburnum carlesii, and most other Viburnum species
  • Multiflora Rose, Rosa multiflora
 

herbaceous Perennials

  • Bugleweed, Ajuga reptans
  • Hollyhock, Alcea rosea
  • American Wood Anemone, Anemone quinquefolia
  • Jack-in-the-Pulpit, Arisaema triphyllum
  • European Wild Ginger, Asarum europaeum
  • Astilbe species
  • Bellflower, Campanula latifolia
  • Chrysanthemum species (some)
  • Glory-of-the-Snow, Chionodoxa luciliae
  • Crocus species
  • Dutchman's Breeches, Dicentra cucullaria
  • Leopard's-Bane, Doronicum species
  • Crested Wood Fern, Dryopteris cristata
  • Spanish Bluebell, Hyacinthoides hispanica
  • Winter Aconite, Eranthis hyemalis
  • Snowdrop, Galanthus nivalis
  • Sweet Woodruff, Galium odoratum
  • Cranesbill, Geranium sanguineum
  • Grasses (most)
  • Common Daylily, Hemerocallis 'Pluie de Feu'
  • Coral Bells, Heuchera x brizoides
  • Hosta lancifolia
  • Hosta marginata
  • Hosta undulata 'Variegata'
  • Common Hyacinth, Hyacinthus Orientalis 'City of Haarlem'
  • Virginia Waterleaf, Hydrophyllum virginianum
  • Siberian Iris, Iris sibirica
  • Balm, Monarda didyma
  • Wild Bergamot, M. fistulosa
  • Grape Hyacinth, Muscari botryoides
  • Sundrops, Oenothera fruticosa
  • Senstitive Fern, Onoclea sensibilis
  • Cinnamon Fern, Osmunda cinnamomea
  • Peony, **Paeonia species (some)
  • Summer Phlox, Phlox paniculata
  • Mayapple, Podophyllum peltatum
  • Jacob's-Ladder, Polemonium reptans
  • Great Solomon's-Seal, Polygonatum commutatum
  • Polyanthus Primrose, Primula x polyantha
  • Lungwort, Pulmonaria species
  • Bloodroot, Sanguinaria canadensis
  • Siberian Squill, Scilla sibirica
  • Goldmoss Stonecrop, Sedum acre
  • Showy Sedum, Sedum spectabile
  • Lamb's-Ear, Stachys byzantina
  • Spiderwort, Tradescantia virginiana
  • Nodding Trillium, Trillium cernuum
  • White Wake-Robin, Trillium grandiflorum
  • Tulipa Darwin 'White Valcano' and 'Cum Laude,' Parrot 'Blue Parrot,' Greigii
  • 'Toronto'
  • Big Merrybells, Uvularia grandiflora