Are the yellow leaves and pink flowers the result of starvation?

Genus: AMSONIA
Variety: ORIENTALIS
Cultivar: yellow lvs.pink flowers TURKISH FORM
Plant family: Apocynaceae
Hardiness zone: H7(below -20C)
Height: 51-100cm.

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Other data

Foilage colour yellow/gold
Foliage season normal
Flower colour pink/red
Flowering season early summer, late summer, autumn
Soil moisture drought resistant, normal
Shadiness half shade, full sun
Hardiness fully hardy

Plant ID 14457