No references indicate lamb's ear (Stachys byzantina) is poisonous to horses. Common toxic plants list: Horse Toxic Plants.
Columbine Losing Foliage: Likely Sawfly Larvae Infestation
Wild Purslane in Your Garden: Edible, Nutritious & Easy to Identify
Identifying Verbascum (Mullein): Lamb's Ear Lookalike with Yellow Spikes
Overwintering Lantana in North Carolina
Controlling Aphids on Hibiscus with Soap Spray
Brown Leaf Edges on Ferns and Hostas: Drainage and Fertilizer Runoff
Transplanting Candytuft in November: Zone 7 Guide
Are Cyclamens Perennials or Annuals?
Monkshood Overcrowding and Identification
Newly Planted Lilac Not Blooming: Patience and Phosphorus for Future Flowers
Optimal Soil pH for Hardy Hibiscus and Blue Hydrangeas
Identifying and Planting a Trichocereus Cactus in Arizona: Timing and Rock Garden Tips
Overwintering Cannas in Zone 5: Digging Is Mandatory — Mulch Won’t Save Them
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