Xylem feeding sharpshooter insects such as the smoke tree sharpshooter. Xylella fastidiosa which is a bacteria that colonizes xylem tissue and is vectored by They include: gall, oleander green and yellowĪphids in spring, soft scale, and oleander leaf scorch caused by the oleander Propagation: Softwood cuttings (most copmmon) or seed.ĭisease and pests: Oleander's problems are well documented.
When oleander are sheared repeatedly, then foliar disease transmission is heightened, water use efficiency is decreased, and over time plants perform poorly and might eventually die. Sadly, many Phoenix oleanders are frequently abused.er, I mean sheared, by often well-meaning, but incompetent ' hort clods' (naive individuals in possession of destructive carbon- or lithium-powered pruning tools). Severe renewal pruning can be done once every two to three years. For dwarf cultivars, prune if needed in late February to early March to any height.įor large cultivars, it's best to prune in late February or August (expect rapid regrowth). Pruning: There are two horticulturally savy ' once-a-year' pruning strategies for oleander in Phoenix. During winter, no supplemental water is needed.
But it does respond well to supplemental water given throughout the warmer times of the year. Watering: Oleander is surprisingly drought tolerant (its leaves have unique sunken stomata called stomatal crypts). Soil: Tolerates all but the most highly alkaline soils. Flowers are heat tolerant in the following manner white > pink > salmon > red > deep red. Temperature: Hardy to 15 o to 20 oF and absolutely thrives in hot In California, oleander floweringis delayed with peak flowering during July along the southern and central California coast. Seasonal color: In Phoenix, oleander flowers profusely from April toĪugust, being most brilliant during May. Only occasionally reseeds in southwest urban landscapes. Seed is wind dispersed in fallĪnd winter. Growth Habit: Moderarte growth rate, vigor is cultivar dependent, ranging from 4 to 25 feet in height.įoliage/texture: Green, lanceolate, whorled, sessile, entire leaves to 4 inches long w/ prominent light green mid vein, leaves taper to acuminate tip medium texture.įlowers & fruits: Many flower colors ranging from white to pink, salmon to burgundy.įruit are narrow, elongated capsules to 5 inches long. Informal hedge, background screen, street and parking lot tree standard.įorm & Character: Oleander is a versatile evergreen shrub, colorful, stiff, low, rounded and mounding to strongly upright and Landscape Use: Multiple uses dependent on vigor of cultivar indcluding USDA 8 (cold protected on south side of buildings), 9-11
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