Oleander flowers

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About Oleander flowers:

Nerium oleander, commonly known as oleander or rosebay, is a plant cultivated worldwide in tropical, subtropical, and temperate regions.
It is known for its drought tolerance, the shrub is often used for ornamental and landscaping purposes.
In Kerala, the plant is known by the names of arali and kanaveeram, and is grown along highways and beaches as a natural, green fencing.
There are different varieties of oleander, each with a flower of a different colour.
The plant has been frequently described in Brihattrayi, Nighantus and other classical Ayurvedic texts.
Charka [Charak Samhita] has prescribed the leaves of white flowered variety externally in chronic and obstinate skin diseases of serious nature including leprosy.
According to Ayurvedic Pharmacopoeia of India (API) an oil prepared from the root bark can be used to treat skin diseases.

Oleander’s toxicity

Ingestion or inhalation of smoke from burning oleander can be intoxicating.
This is due to the properties of cardiac glycosides (a type of chemical) including oleandrin, folinerin, and digitoxigenin, which are present in all parts of the plant.
Effects of oleander toxicity include nausea, diarrhea, vomiting, rashes, confusion, dizziness, irregular heartbeat, slow heartbeat, and, in extreme cases, death.

Q1: What is the characteristic of temperate climates?

These are characterized by relatively moderate mean annual temperatures, with average monthly temperatures above 10°C in their warmest months and above −3°C in their colder months.

Source: Why Kerala has banned oleander flowers in temple offerings