Temperature & Humidity. Calla lily plants grow best where conditions are warm with temperatures of at least 70 F (21 C) during the day. Humidity in the environment also plays a key role in maintaining adequate levels of moisture. Calla lily flowers can tolerate high temperatures in most gardens, provided the humidity conditions are ideal.. These include soil type, temperature, and providing the right amount of light. 1. Check the soil. (Image credit: Nico De Pasquale Photography / Moment / Getty Images) Juan Palacio, the CEO of BloomsyBox, says, "The key to successfully growing calla lilies indoors starts with the soil.".

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Zantedeschia. Common name: Arum lily, calla lily. These striking plants have large fluted, scrolled flowers, usually richly coloured or pure white. Some are hardy, while others need to be kept frost free. They are ideal for adding tropical summer colour to borders, containers and your home.. Calla lily, also known as arum lily, is not a true lily. It belongs to the genus Zantedeschia which originates from South Africa. With huge, exotic looking flower-like spathes now available in a wide range of colours, calla lily is becoming increasingly popular as a house plant as well as a garden and patio plant.