All 4 plants description are below. EuphorpiaBright-green leaves grow along its thick, thorny stems. Lower leaves naturally fall off as the plant ages. If your plant gets too tall and leggy, you can prune it back by half its size in spring. This will cause it to branch out.New stems will grow from below where the pruning cuts were made, making this succulent bushy and full.Euphorbia includes annuals, perennial herbs, shrubs and trees that have a corrosive and poisonous milky sap. Many are succulent and can either be thorny or unarmed. The deciduous leaves can either be alternate, opposite or in whorls. All spurges produce unisexual flowers.Its flowers are actually bracts that last for several weeks and are available in bright pink, red, white or yellow. Today's hybrids produce more -- even bigger -- flowers than ever before. Spring and summer are usually the best seasons for an abundance of blooms. Crown of Thorns flower dependably when they get enough light. They're easy to grow and drought-tolerant, prefering slightly dry, sandy soil.This succulent stores water in its thick stems just like a cactus, so it can be watered less frequently than other house plants. If its leaves turn yellow and fall off, cut back on the watering.Aloe veraAloe vera is a desert-climate plant that stores water in its leaves and is commonly used as a topical medicine for minor cuts, rashes and burns. Gelled and added to lotions and creams, aloe vera is popular because of its soothing and cooling effects on the body, particularly when used to treat sunburns. Also used as a digestive treatment for ulcers and constipation, aloe can be added to foods, beverages and supplements and taken orally. Though much debate exists over the healing nature of the plant, its popularity as an anti-bacterial and anti-fungal agent adds to the healing ethos of aloe vera.Citronella Citronella is one of the most common ingredients in insect repellents, due to its strong smell, which masks mosquito attractants.The perennial clumping grass grows 5 to 6 feet, and can be planted in the ground or kept in large pots.Citronella plants thrive best in full sun and areas with good drainage.Lemon GrassResembling a gigantic weed, lemongrass is an aromatic tropical plant with long, slender blades that can grow to a height of 5 ft (1.5 m). Believed to have a wide range of therapeutic effects, the herb has been used forcenturies in South America and India and has also become popular in the United States. Aside from folk medicine, lemongrass is a favorite ingredient in Thai cuisine and dishes that boast a tangy, Asian flavor. USE1. Relieving anxiety2. Lowering cholesterol3. Preventing infection4. Boosting oral health5. Relieving pain6. Boosting red blood cell levels