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Hedgenettle (Stachys)
The plant is non-toxic.
Heliotrope (Heliotropium arborescens)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Helium
Keywords: balloon, foil balloon
Inhaled in small amounts, helium gas is not considered dangerous. In addition to a high-pitched voice, inhaling helium gas may cause symptoms such as headache and dizziness. These are caused by hypoxia resulting from the helium gas displacing oxygen.
Hellebores (Helleborus)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Hemp-agrimony (Eupatorium cannabinum)
The plant is non-toxic.
Henbane, Black Henbane (Hyoscyamus niger)
Highly toxic. The whole plant contains toxic alkaloids, such as atropine and scopolamine, which cause anticholinergic symptoms. Typical symptoms include dryness of the mouth, dilated pupils, tachycardia, hallucinations, altered level of consciousness, and convulsions. If the plant has been ingested, the patient should seek medical attention.
Herb Paris (Paris quadrifolia)
The plant is toxic, but ingesting a small amount rarely causes symptoms. If berries have been ingested, monitoring at home is sufficient. If more symptoms develop, including severe vomiting, seek medical attention.
Herbicide
Keywords: glyphosate
The content varies. Contact the Poison Information Centre to confirm toxicity.
Hesperis (Hesperis)
The plant is non-toxic.
Hesse's leopard plant (Ligularia hessei)
The plant is non-toxic.