Mildew is also called powdery mildew because its most obvious symptom is a whitish covering on oleander stems and leaves that looks as if someone dusted the plant with talcum powder.
In their perennial range across oleander hardiness zones 8-10, most oleanders can only handle temperatures that dip no lower than 15 to 20 degrees F. (10 to -6 C.). Sustained exposure to these temperatures can damage plants and inhibit or reduce flowering.
Unlike many flowering plants that attract a host of bees, butterflies and hummingbirds, oleander (Nerium oleander) stands unvisited by most pollinators. Although deceit and cheating are frowned upon in the human world, they are sometimes admirable qualities in the plant world.
Oleander's Origins Oleander is a dense, fast-growing evergreen shrub that has been around since ancient times, native to North Africa and the eastern Mediterranean regions.
Insect Cheating Unlike many flowering plants that produce individual pollen grains, oleander produces pollen aggregates -- clumps of pollen grains held together by a sticky substance. This allows pollinators to pick up and disperse multiple pollen grains from a single visit.
Growing Oleander in Containers In fact, oleander is just easy to grow in general. When growing oleander in containers, it's important to give them plenty of sun and adequate water. Although they can handle drought conditions when planted in the ground, container grown oleanders should Read more
Oleanders do best in full sun but will tolerate partial shade; too little light will cause the plant to get a leggy, open look and reduces flowering. If you're looking to create a "green wall" with your oleander plants, they should be planted at 5 Read more
The best time to plant oleanders is in early spring or fall, although you can plant them any time as long as the ground isn't frozen. If possible, wait to plant in overcast conditions or in the early evening to give plants time to process Read more
Wood Decaying Fungi Also called rots, wood decay diseases in oleander are usually caused by Schizophyllum commune, which causes white rot. As the disease progresses, it produces annual, stalkless conks -- which look like mushrooms -- that grow in clusters near the base of the Read more
Oleanders are extremely tolerant of a broad range of soil types, from heavy clay to well-drained sand. These plant materials can also withstand relatively high levels of sodium, chloride and similar salts in the soil, as well as salt spray on the foliage. Oleanders also Read more
Rooting Oleander Cuttings Be sure to cut just below a leaf node. Cut all the lower leaves off your oleander cutting, leaving only the tip growth. You can either place these oleander cuttings in a mixture of water and rooting stimulant until you are ready Read more
Coffee grounds can usually be used on plants that need more acidity but how to use them is important. Be sure to check the ph of your plants before adding coffee grounds. Oleanders like a pH-Value between 6 and 8.3 and a good fertilizer recommended Read more
Oleanders do not cause allergies, but pollen and mold may collect on them and disperse during windy weather. Molds are microscopic fungi without roots or leaves that live on plant or animal matter. They reproduce by releasing spores into the air, floating like pollen, and Read more
Young plants can be repotted every year, older plants every three years. If repotting is difficult (e.g. when it comes to older pot plants) then only the top layer should be replaced from time to time, once more using a little clay or loam throughout Read more
Oleander plant fertilizer is not usually necessary since, as mentioned, they are a fairly low maintenance plant. In fact, they rarely need any soil amendments or fertilizer at planting. Fertilizing oleanders can actually burn the roots and cause damage to the plants.
Oleander remains toxic when dry. A single leaf can be lethal to a child eating it, although mortality is generally very low in humans. The lethal dose of the green oleander leaves for cattle and horses has been found to be 0.005% of the animal's Read more
If your oleander is too tall and its size is a problem, you will want to cut it down to size. Since pruning oleander actually encourages growth and branching, cut stems at half the desired height of the plant. For instance, if you'd like your Read more
Improper Watering The Oleander plant is considered sturdy and drought tolerant, but it enjoys plenty of watering during dry periods. Most gardeners end up overwatering this plant after the soil has dried out. Oleander plants cannot withstand overwatering.
This shrub defies conventional pollination methods by relying instead on two botanically surreptitious adaptations -- deceit pollination and insect cheating. Although deceit and cheating are frowned upon in the human world, they are sometimes admirable qualities in the plant world.
Oleander should be one of the easiest plants to grow in this climate and soils. Something is definitely wrong. Gypsum and Epsom salts are not complete fertilizers. They contain a lot of calcium and sulfur as well as some magnesium but nothing to encourage plant Read more
Oleanders can go outdoors for the summer months. Buy and plant oleander bushes in spring or summer. Plant in a good-sized pot using a soil-based compost and place in a well-lit spot under cover away from central heating, or plant outdoors in a sunny, sheltered Read more
Although the shrubs are drought-tolerant, they look their best when they are watered during dry spells. However, take care not to overwater them. Yellowing leaves indicate that the plant is getting too much water. If the soil is poor, feed the plant lightly with a Read more
Poisonous Plants for Dogs and Cats: Oleander Oleanders are commonly used in landscaping along fences for privacy and for their beauty. Unfortunately, the Oleander plant is toxic for all mammals, including dogs, cats, rabbits, horses, goats, and pigs.
Fertilize oleander plants three times during the growing season to stimulate growth, usually in April, June and August. Apply one pound of nitrogen-based fertilizer for every 1,000 square feet throughout the area where oleander is planted.
If you see brown leaves, this is an indication that your plant has contracted OLS. There is no way to cure this bacterial infection that infects oleander plants. If you detect OLS, act swiftly to prevent the bacteria from spreading to other healthy oleander plants.
So how much should you be watering oleander plants? They like to be watered as much as you would water your shade trees – deeply every three days. To aid in water retention, create a reservoir or dike that is 2-4 inches tall around the Read more
Oleander Leaves are Curling from Pests If you've resolved any watering problem and you've determined the problem isn't oleander leaf scorch, be on the lookout for bugs, as certain pests can cause oleander leaf curl. Look closely for aphids, scale, or mealybugs.
These browning tips are also a sign of oleander leaf scorch, but this particular sign can also indicate high salts in the soil. Even if you see only a few leaves affected, the entire shrub is infected and will die within 3 – 5 years.
Other Common Oleander Pests Oleander is sometimes bothered by scale insects, including armored scales and soft scales. Armored scales are tiny, sucking insects protected by a flat, hard covering. If you remove the covering, the insect will remain on the plant.
Ideally, the oleander (Nerium oleander) is pruned after blooming. All types — spring or free-bloomers - should be pruned by the end of August or early September to give any new growth sufficient time to harden off before winter. Oleanders should be cut back just Read more
The oleanders (Nerium oleander) are just moderately cold hardy to USDA Hardiness Zone 8; higher, they may survive only as herbaceous perennials. But where they thrive, they flourish.
Oleanders grow best in full sun and will tolerate even reflected heat from a south or west wall. They will tolerate partial shade, but may have a lanky, open shape. Oleander (Nerium oleander) leaves and branch habit. Oleanders are tolerant of many different soil types, Read more
Although oleanders are highly drought tolerant, they benefit from irrigation during long dry spells. However, too much water can harm the plant and may be to blame for an oleander with yellow leaves. If improper watering is the cause, the plant should soon rebound with Read more
When taken by mouth: Oleander is LIKELY UNSAFE for anyone to take by mouth. It can cause nausea, vomiting, diarrhea, weakness, headache, stomach pain, serious heart problems, and many other side effects. Taking oleander leaf, oleander leaf tea, or oleander seeds has led to deadly Read more
Even a light dusting of frost can burn the developing leaf and flower buds of oleander. During heavy frosts and freezes, plants may die back all the way to the ground. But in their hardiness range, oleanders that die to the ground typically don't die Read more
So how much should you be watering oleander plants? They like to be watered as much as you would water your shade trees – deeply every three days. Also, if it is especially arid and has been, mist the plant to help stave off defoliation.
Oleander hedge spacing should be at least 4 feet apart. This plant's quick growth rate will fill in the gaps soon enough. While oleander is drought tolerant when established, water it regularly the first season.
Despite the danger, oleander seeds and leaves are used to make medicine. Oleander is used for heart conditions, asthma, epilepsy, cancer, painful menstrual periods, leprosy, malaria, ringworm, indigestion, and venereal disease; and to cause abortions.
Oleanders are tolerant of many different soil types, but must have good drainage. They will not do well in wet areas. Oleanders are very drought-tolerant once established, but respond well to occasional deep watering.
Oleander aphids suck up sap from the host plants and produce a sticky substance called honeydew. Honeydew is sugary, and something other insects, such as ants, like to eat. Honeydew is not attractive on the leaves of oleanders. As it accumulates, unattractive black sooty mold Read more