Now individually select the duplicated leaves and adjust the scale in the Z direction of them to get a good leaf shape. At the tip of the leaf rotate the tip 90 degrees and then rotate the leaves close to the tip slightly to even the transition out. While you are adjusting the scale of each leaf, take a look at the position in relation to the Stem, you may have to adjust the Y and Z position slightly to make a better fit.

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Select all of the leaves except for the tip.

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Group them together.

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Select the option box next to Duplicate.

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Use the setting below, this will duplicate and mirror the leaves in the Z direction.

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Now select all of the leaves and the Stem and group them together.

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