A new and distinct cultivar of Aster plant named `Yohenry the Third`, characterized by its uniform, upright and mounded plant habit; freely branching growth habit; dark green-colored foliage; uniform and freely flowering habit; natural flowering season mid-September in the northern hemisphere; decorative-type inflorescences with violet blue-colored ray florets; and good garden performance.

 
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< Nectarine tree named `Nectarexquise`

> Hosta plant named `Fragrant Queen`

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