Hothouse plants are those that are grown in a controlled environment, usually inside a greenhouse or under specific conditions. Synonyms for hothouse plants include greenhouse plants, hot weather plants, warm climate plants, temperature-sensitive plants, and tropical plants. These terms refer to flora that can only thrive in a specific range of temperatures, humidity, and other environmental factors. Hothouse plants are often more delicate and require more care than those grown outdoors, as they are not exposed to the same fluctuations in weather or insect populations. Cultivating hothouse plants can be rewarding, as they often produce unique, exotic blooms and foliage that cannot be found in a traditional outdoor garden.