Chlorophytum has a strong absorption capacity for formaldehyde, carbon monoxide, nitrogen peroxide and other toxic chemicals in the air. ) alias chlorophytum, diaolan, perennial evergreen herb of Liliaceae. It has cylindrical fleshy roots, basal leaves, linear lanceolate and width of 1 cm to 1.5 cm. Flower buds are extracted from leaf axils, forming creeping branches, hanging downwards, and many small plants with air roots will grow at the top and nodes. Racemes with small white flowers bloom from March to June. Common varieties are Phnom Penh, Golden Heart, Silver Edge, Silver Heart Chlorophytum and so on. Native to South Africa, it is active, adaptable, lush and easy to cultivate. I like warm and humid semi-cloudy environment, but I can't stand cold and heat. The suitable temperature is 65438 05℃ to 25℃, and it is higher than 65438 00℃ in winter. I like loose and fertile sandy soil with good drainage and rich humus. Potted soil can be mixed with humus soil 1+ pastoral soil 2+ river sand 1+ a small amount of farm manure. Usually see dry watering, often keep the basin soil moist, and spray water on the leaves in dry season to prevent yellowing of the leaves or dryness between the leaves. Thin fertilizer can be applied once a month, such as compound fertilizer, not too much at a time, just a few grains, otherwise it is easy to burn roots. Stop fertilizing in winter, and the pot soil should be drier. Propagation can be carried out in individual plants, or young plants can be directly cut from creeping branches and planted separately. Whole grass can be used as medicine. 2, Pittosporum (absorbing photochemical smog, dustproof and soundproof. ) Also known as Qilixiang, Pittosporum is an evergreen shrub or small tree. The height of potted plants varies from 0.5 m to 1.5 m. The leaves are leathery and shiny, with terminal umbels, flowering from April to June, and the flowers are white or greenish and fragrant. Sex likes warm and humid environment, likes sunshine, and is also resistant to semi-shade, requiring loose and fertile soil. 2 parts of humus soil or peat soil+65438 parts of garden soil+0 part of mixed potted plant, which is used as base fertilizer. Always spray water on the leaves during the growth period, and the water should be dry and wet. Before and after flowering, a pancake should be fertilized with water. I like plenty of light, the wintering temperature is higher than 5℃, and watering is controlled when the room temperature is low in winter. Pittosporum has strong branching ability and is resistant to pruning, so it should be pruned from seedlings, and topping can promote the development of lateral branches, and the crown is often pruned into a ball shape. Potted young plants can be changed once a year, and the adult plants can last for about 2 years. Propagation by sowing in the south and transplanting in the north. Cutting is best in rainy season. Cut the semi-lignified branches into cuttings, shade them and water them. After about one month, callus can grow and new roots can sprout. 3. Aloe can reduce the pollution of benzene and formaldehyde and increase the concentration of negative oxygen ions. It can also be used for relieving inflammation and treating traumatic injury. ) perennial evergreen herb of Liliaceae. Fleshy leaves alternate with cylindrical fleshy stems. There are many varieties, including arborvitae aloe, American aloe and China aloe. Racemes are extracted from leaves and grow upright, with small orange flowers with red spots. Like warm and humid climate conditions, not cold-resistant, and the room temperature in winter is not lower than 5℃. Not strict with soil requirements, drought-tolerant and salt-tolerant, like good drainage, fertile and loose sandy loam. I like sunshine, I don't like shade and shelter from the wind, or I often pick leaves, and I don't like flowering. Potted soil can be made by mixing 2 parts of garden soil+1 part of river sand+1 part of humus soil and a small amount of base fertilizer (such as decomposed manure, chicken and duck manure, etc.). ). In the vigorous growth period of spring, summer and autumn, the basin soil should always be moist, but no water should accumulate. In the growing period, you can apply decomposed pancake fertilizer water or rice washing water for 2-3 times. Stop fertilizing in winter and reduce watering, otherwise the roots will rot easily. Commonly used cuttage and ramet propagation. Cut off the small lateral branches at the base of the main stem or between leaf axils, with the length of 10cm ~ 15cm, dry in the shade 1 ~ 2 days, insert them into river sand, spray water slightly, and take root after 20 ~ 30 days, or cut off the main stem for cutting. Plant division can be carried out when changing pots in early spring. Cutting the new tillering plants around the mother plant from the underground stem of the mother plant can plant new pots. This method has low propagation coefficient. Plants with vigorous growth can change pots every two to three years in spring, remove the old pot soil and replace it with new nutrient soil. Canna has a strong ability to absorb sulfur dioxide. ) Cannaceae perennial herbs. Easy to cultivate, like sunshine and warm climate, not cold-resistant. The requirements for soil are not strict, and fertile, deep and well-drained sandy loam is the best. Fear of waterlogging, soil water is easy to rot roots. Short-flowered and large-flowered varieties can be selected when potted. Canna tubers should be buried in pots with a diameter of about 40 cm in late April. Before planting, sufficient organic fertilizer combined with nitrogen and phosphorus should be applied to the bottom of the pot as base fertilizer. During the growth and flowering period, compound liquid fertilizer (or fat water made of chicken manure or sesame sauce residue) should be applied many times. Don't water it too often after planting, and put it in a sunny and ventilated place indoors. If fertilizer is insufficient or phosphorus and potassium fertilizer are not applied, plants will be weak, only stems and leaves will grow, and few or no flowers will bloom. After the flowers wither, cut off the buds in time and apply liquid fertilizer. 5. Evergreen can effectively remove the pollution of trifluoroethylene. ) perennial evergreen herb of Liliaceae. Rhizomes are thick and short, with fibrous roots, basal leaves, banded or oblanceolate, and terminal spikes. There are many cultivated varieties, such as Phnom Penh, Silver Border and Spotted Evergreen. I like semi-cool environment, and put it in a cool place in summer to avoid strong light. I can change the pot once a year from March to April. When changing pots, I will remove the aged roots and persistent dead leaves and plant them in acidic cultivation soil with base fertilizer. Leave it in the shade for a few days after serving. Don't water the basin when watering, it would be dry rather than too wet. In addition to keeping the soil moist in summer (when the climate is hot, water should be sprayed around the flowerpot in the morning and evening), and watering should not be too frequent in spring and autumn. Dilute liquid fertilizer can be applied two or three times during the growth period. Potted soil can be cultivated in general garden soil, but sandy loam with rich humus and good water permeability is the best. In addition, tiger-eye evergreen, Guangdong evergreen and mosaic evergreen can all be used as indoor potted plants. 6. Bambusa gigantea has a strong ability to absorb carbon dioxide at night. ), also known as Penglai banana, is a perennial evergreen vine of Araceae. There are also spotted leaves, bamboos and so on. Its stem is as thick as bamboo, and there are a lot of fleshy air roots on it. Leaves alternate, the leaves are nearly round and huge, and the young leaves are heart-shaped without perforation. When it grows up, its big leaves are scattered with many rectangular holes and deep cracks in the shape of tortoise shells. Native to South America, I like warm and humid environment, prefer semi-cloudy, avoid direct sunlight, and prefer fertile sandy loam rich in humus. Potted soil can be mixed with humus soil (peat soil) 2 parts+garden soil 1 part+river sand 1 part+a small amount of base fertilizer. The suitable growth temperature is 20 ~ 25℃, and the overwintering temperature is more than 8℃. Thin liquid fertilizer (such as cake fertilizer and water) can be applied once a month during the growing period, and it is usually better to be wet than dry. When the air is dry, you can spray water on the leaves and the ground. When a plant grows up, it needs to be supported or climbed along the object. Cutting is the main breeding method. In April and May, stem segments with two or three nodes can be cut. After removing aerial roots, it can be vertically inserted into plain sand pots, with one section exposed outside the sand, and one plant in each pot can be placed in a warm and semi-cool place for moisturizing. It can take root and sprout in one month. In addition, plants that can absorb carbon dioxide at night include Crataegus pinnatifida, Crataegus pinnatifida and cactus, purple pineapple and torch pineapple of pineapple family, agave and so on. Plants that can purify the air are pomegranate, carnation, rose, rose, daisy, flying grass, sedge and so on. Indoor greening plants should be reasonably matched in order to be more conducive to our health.