It is generally safe to touch plants at night. However, certain plants, such as those containing toxic chemicals, can cause skin irritation or allergic reactions regardless of the time of day. It is important to be cautious and aware of the specific characteristics of the plant you are dealing with.
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Some plants, particularly those in the family Apiaceae (such as giant hogweed and wild parsnip), contain chemicals that can cause photodermatitis. This is a condition where the skin becomes sensitive to sunlight and can suffer severe inflammation after exposure. If you come into contact with these plants and then expose your skin to sunlight, you may suffer from phytophotodermatitis, which can lead to blistering, burns, and long-lasting skin discoloration.
The best practice is to avoid direct contact with plants that are known to cause skin irritation or phototoxic reactions. If you are handling plants or working in a garden at night, it is generally recommended to wear gloves to protect your hands from potential irritants. Also, make sure to wash your hands thoroughly after gardening or touching plants to remove any potential allergens or toxic substances.
It is worth noting that the aforementioned risks are not exclusive to nighttime. Some plants may still cause skin irritation even without exposure to sunlight. In general, it is best to familiarize yourself with the characteristics and potential risks of the plants you are dealing with, and take necessary precautions accordingly.