A compost for shrubs and trees is the best compost for oleander. The woody plant in question (Nerium oleander) manages to adjust to a range of environmental conditions so in acidic soils ericaceous compost can be used. A compost of oleander leaves and twigs may be used since the oleander toxin oleandrin reduces to less than 10 percent of original concentration after 50 days and to non-detection after 300 days, according to research by Arthur Craigmill of University of California at Davis and James A. Downer of University of California Cooperative Extension.
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