All houseplants should be considered potentially harmful. Schefflera (the most common "umbrella plant") is specifically listed as poisonous. However, your grandson's hives suggest an allergic reaction, not poisoning—different mechanism, same result: keep the plant away from him.
Multiple species share this common name:
Moving a Purple Pitcher Plant Outdoors in Zone 8b: Wait Until Spring
Winter Care for Nepenthes alata: Feeding and Light
Growing Nepenthes alata x ventricosa on a Chicago Porch
Pruning and Propagating an Overgrown Umbrella Tree (Schefflera)
Reviving Divided Wandering Jew: Sun Is Critical
Money Tree Toxicity: Safe But Keep Away from Toddlers
Asian Lilies Are Toxic to Cats: Immediate Veterinary Care Needed
Yucca Plant Decline: Why Fertilizer Spikes Make It Worse
Umbrella Tree vs. Umbrella Plant: Cat Safety Clarified
Transplant Shock in Azaleas: Why Leaves Droop After Moving and How to Help
Ornamental Pokeweed (Phytolacca): Showy Berries but Still Poisonous
Acclimating Papyrus to Cool Spring Nights in Zone 6
Are Stargazer Lilies Poisonous? Cat Toxicity & Safety Guide
Toxic Houseplants: Identification and Safety for Homes with Children and Pets
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