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In page Climate of Zambia:

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Deciduous trees which lose leaves in the dry season to conserve water predominate over evergreens which have waxy leaf cuticles for the same purpose. The deciduous trees usually produce fresh green or reddish leaves just before the rainy season. Grasses and some other herbaceous plants dry up above ground but regenerate quickly with the onset of rains from roots and tubers, etc.[1][citation needed]