Kalanchoes are perennial, short-day-blooming succulent plants that bear bunches of small blossoms on branching bracts. They are typically grown indoors, but can be placed outside whenever temperatures are warm enough, or if winter temperatures don't get low enough to harm them. Grown indoors or outside, kalanchoes still need bright light, dry periods between watering and room to spread their root system.
While temperatures of 50 to 60 degrees Fahrenheit will keep the Kalanchoes in bloom, freezing temperatures can kill them. In zones 10 and 11, they can be planted directly in the landscape with minimal winter protection and will function as perennials. Even a few hours of temperatures near 40 degrees can kill unprotected kalanachoes.
Kalanchoes are lovely in or out of bloom, but need short daylight hours to produce blooms. Kalanchoes planted where nighttime lighting reaches the leaves may not produce blooms as often as those planted where they have long stretches of darkness at night. In zones 10 and 11, summertime direct sunlight can burn the leaves. Planted near a deciduous tree with dappled shade, kalanchoes benefit from more winter sun and less summer sun.
North of zone 11, kalanchoes are grown as summer annuals, or must be planted in pots so they can be moved indoors when frost threatens. If they are set outdoors in an area with intense, full sunlight, they must be gradually adjusted to the lower light levels they will experience indoors.
Heavy winds can break the succulent stems of kalanchoes or even uproot them. Place the container in a sheltered area. Kalanchoes also do not "play well" with other plants, in that they have a very demanding root system. They need plenty of root space from other plants and particularly don't compete well with grass. The more root room they have in the ground or in their containers, the larger the plant will grow and the more bloom clusters it can support.