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How harmful is oleander to goldfish?
Oleander, also known as willow-leaf peach, belongs to the genus Nerium in the family Apocynaceae. It has been introduced into China for a long time and is cultivated in various places; it is a common ornamental flower in gardens. The entire oleander plant is highly toxic, and accidental ingestion by humans or livestock is dangerous. There are numerous instances in which oleander leaves, petals, fruits and small branches falling into goldfish tanks have caused the death of all the young and adult goldfish. The reason is that oleander mainly contains cardiac glycosides such as yellow oleandrin A, yellow oleandrin B, oleandrin A, yellow oleandrin A monoside methyl, yellow oleandrin A monoside ethyl and yellow oleandrin C, which have highly toxic effects on fish and can cause acute
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How to propagate oleander? A detailed explanation of the common propagation methods
Cuttings are the main method, though layering also works. 1. Cuttings: from late March to early April each year, select healthy 1-2 year old branches as cuttings, cut them into 15 cm long pieces, and soak them in clean water at 20°C, with the submerged depth being 1/3 of the cutting length, changing the water once a day. After 7 days, when the wounded area in the water turns white, take them out and insert them into the cutting medium, and provide shading and moisture retention; roots can form in about 1 month. Alternatively, water-propagate in June-July; after rooting in 1 month, move them into soil. 2. Layering: do it during the rainy season; roots can form after 2 months.
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How to prevent and control powdery mildew on roses? Oleander has a clever trick
In spring, roses are prone to powdery mildew. After the disease develops, a layer of white powder appears on the leaf surface, seriously affecting the normal growth and development of the plant. Oleander is very effective at preventing and controlling powdery mildew on roses. The specific method is: 1. Crush fresh oleander leaves, soak them in clean water in a cool place for 1-2 days, without letting them ferment or spoil, then use a gauze net to filter out the crushed oleander leaves, and spray the remaining water with a sprayer onto the affected parts of the roses for 3-5 consecutive days, for a good effect. You can also soak the diseased branches and leaves directly in water made from oleander leaves
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Oleander Management Methods and Daily Care Key Points
Oleander, also known as Bannianhong or Liuyetao, originated in Iran and India. Because it is evergreen and does not shed its leaves, has double-petaled fragrant flowers, comes in many colors including red, yellow and white, is easy to propagate, simple to manage, has a long flowering period and a well-formed crown, it is loved by people. It can be cultivated in both southern and northern China, whether in pots or in the ground, and is a commonly planted flower in courtyards and flower beds; it is also associated with good fortune. However, in oleander management, three points must be handled well: it must be pruned at the right time. The top branches of oleander have the characteristic of one branch dividing into three, and it can be pruned and shaped as needed. For example
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Symptom Identification and Control Methods for Oleander Leaf Spot
Symptoms: The spots occur at the edges or center of the leaves, semicircular or circular in shape; when several spots merge, they form a wavy pattern. They appear on both the upper and lower surfaces, with the upper surface slightly darker than the lower, and the spots are grayish-white or grayish-brown. In the later stage, a black powdery mold layer appears on the diseased parts, generally on old leaves. Pathogen and disease status: The pathogen is a fungus of the genus Alternaria (Alternaria sp.). Spores spread by wind and rain, and excessive rain easily triggers this disease. The disease occurs more often on old leaves, lower leaves, and tiller shoots sprouting from the roots. Control methods: 1. Strengthen
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How to prevent and treat oleander black spot disease? Here are the methods
Symptoms The spots occur on the edges or middle of the leaves, semicircular or circular. When several spots join together, they form a wavy pattern, present on both the front and back sides, with the front darker than the back; the spots are grayish-white or grayish-brown; in the later stage, a black powdery mold layer develops on the spots, generally occurring on overwintering leaves. Pathogen The pathogen is a fungus, Alternaria sp. The conidia are olive-colored, oval, with both longitudinal and transverse septa, in chains, borne on relatively long conidiophores. Disease pattern Generally, old leaves, lower
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What are the values and uses of oleander?
The oleander has a rounded, neat plant form, with leaves like bamboo and willow, and flowers that resemble peach blossoms yet are not peach blossoms. Its flower colors are fresh and lovely, and it stays evergreen all year round, giving it considerable ornamental value. "Its leaves are sparse like bamboo, its blossoms tender like peach; the country folk never tire of looking at it, facing the tree with a cup of wine." From this ancient poem it can be seen that the oleander has been an ornamental flower deeply loved by people since ancient times. The oleander is now grown in nearly 90 countries, and because it grows quickly it is regarded as a fast-growing landscaping tree species. Algeria has even designated it as its national flower. The stems and leaves of the oleander contain oleander cardiac glycosides, organic substances from which cardiotonic agents can be extracted, with diuretic, analgesic, and phlegm-clearing and asthma-relieving effects
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How to grow potted oleander? Master these care essentials
Oleander, also known as willow-leaf peach and half-year red, is an evergreen large shrub of the genus Nerium in the dogbane family Apocynaceae. When potted, it is often trained into a small tree form, with a plant height of 2 m to 3 m. The stem is upright and smooth, old branches are grayish brown, young branches are green, with strong branching ability, mostly growing in a three-forked pattern. The leaves are lanceolate, in whorls of 3, thick and leathery, with short petioles, 10 cm to 25 cm long, with sharp tips and wedge-shaped bases, dark green on the surface and light green on the underside, with a prominent midrib and entire margins. The petioles and inflorescence stalks are purplish red, and there is a small amount of milky sap in the branches and leaves
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Introduction to Oleander Varieties: Get to Know the Common Oleander Varieties
1. White-flowered oleander is a cultivar of oleander. The flowers are white and semi-double. The leaves are relatively small, and both the branches and the stems are pale greenish-white. 2. Variegated oleander is a cultivar of oleander. The flowers are red and single. The leaf surface has markings. 3. Pale yellow oleander is a cultivar of oleander. The flowers are pale yellow and single. 4. Double-flowered oleander is a cultivar of oleander. The flowers are red and double.
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What kind of growing environment does oleander like?
It likes sunny, warm and humid environmental conditions. It is relatively cold-tolerant, slightly shade-tolerant, slightly alkali-tolerant, tolerant of drought and poor soil, and intolerant of waterlogging; it has a certain resistance to toxic gases such as smoke and dust and sulfur dioxide. It is suitable for growing in fertile, loose, well-drained slightly acidic to slightly alkaline soil. Light and temperature: potted oleander needs to be brought indoors to overwinter, with the room temperature kept above 5°C, placed in a spot by a window with full sunlight. Generally it is moved into the greenhouse around October 20 and moved out of the greenhouse around April 20. After being moved out, it should first be placed in a wind-sheltered, sunny spot, then gradually
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