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Hibiscuses (Hibiscus)
The plant is non-toxic.
Hogweeds, Cow parsnips [F] (Heracleum)
[F] = May cause a phototoxic reaction if the skin is exposed first to the sap and then to sunlight. Photodermatitis, or phytophotodermatitis, is manifested as redness, blistering, and burning of the skin. Skin exposed to the sap should be washed with soap and water. Symptoms can be avoided by protecting the skin from sunlight for at least 48 hours. Skin symptoms may be severe and require medical attention.
Holly (Ilex)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Hollyhock (Alcea)
The plant is non-toxic.
Honeysuckle (Lonicera)
The plant is toxic, but ingesting a small amount rarely causes symptoms. If the berries were tasted, monitoring at home is sufficient. If more symptoms develop, including severe vomiting, seek medical attention.
Honeyberry, haskap (Lonicera caerulea var. kamtschatica/ edulis) berries are non-toxic.
Hops (Humulus)
The plant is non-toxic.
Horse chestnut (Aesculus)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Horsetail (Equisetum)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Hortensia (Hydrangea)
The plant is toxic, but ingesting a small amount rarely causes symptoms.
Hosta (Hosta)
The plant is toxic, but ingesting a small amount rarely causes symptoms.