The transpiration rate of potted oleanders ( Nerium oleander L.) in a greenhouse was reduced 25-35% for 2 weeks after being sprayed with a film-forming antitranspirant. Measurements of moisture changes in a heterogeneous soil in the median strip of a major freeway indicated that the antitranspirant slowed the depletion of soil water. This was confirmed when detailed measurement of moisture in a more uniform field soil showed a 40% reduction in water use by oleanders. These studies suggest that an antitranspirant could delay irrigation of highway oleander plantings by at least 2 weeks, reducing the costs and hazards associated with irrigation of ornamental plantings along highways.
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Davenport et al. (1973) studied this question.
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