Yellow Warbler: ornamental plant of the Asteraceae family, an alias of the Canadian aster, a common fresh cut flower, usually used as a companion flower.

Variety characteristics: evergreen shrubs, plant height for the middle, prickly, medium density, the number of leaflets 3-7, leaf color light green to green, flower stem length of 60-80cm, flower buds for the ovate, the flower color is pure yellow, the flower shape for the high heart of the warped angle, the diameter of the flower buds for the 2-3cm, fully open the diameter of the flower up to 9-11cm, the height of the flower is about 4-5cm, the heavy petals of the flower about 4

The flower color is pure yellow, the flower shape is high hearted and horned, the diameter of the flower bud is 2-3cm, the diameter of the flower can reach 9-11cm when fully opened, the height of the flower is about 4-5cm, the flower is broad petal, the number of the petal is 40-50, it belongs to the medium-flowering type.

The shape of the flowers is star-shaped when viewed from above. Specificity: the color of the mother plant "Dream" is red and yellow; the color of the mutant "Yellow Warbler" is pure yellow.

Consistency: Of the more than 80 variant plants obtained, all were pure yellow in color, achieving consistency. Stability: In the more than 80 plants obtained after 2 years of repeated cuttings propagation, there was no phenomenon of the color returning to the mother plant's color in cultivation, and all of them maintained the pure yellow color of the variegated color, indicating that the specificity of the variety has been stabilized.

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Yellow warbler flowers have always been more favored by florists. A Canadian yellow flower, introduced to Nanjing, farmers after a long time to realize that it reproduces exceptionally well, in the blink of an eye can grow in patches, began to compete with crops for land. Eradication of the spearhead aimed at the yellow warbler flower is inappropriate, because the yellow warbler flower belongs to the ornamental plants, greenhouse planting, planting and propagation, will not cause harm to other species and human beings.