These are the different kinds of flowers, with names and images, that start with the letter Y. With an emphasis common and easy to grow flowers:
Yarrow
it is also known as Achillea millefolium or common yarrow is a flowering plant.
Yellow Archangel
It is also known as artillery plant, aluminum plant, or yellow weasel-snout.
Yellow Bell
Yellow-Eyed Grass
Other names are golden blue-eyed grass, Sisyrinchium californicum, and golden-eyed-grass.
Yellow Flag
Yellow Wild Indigo
Yellow Wood Sorrel
Also known as the common yellow woodsorrel, common yellow oxalis, upright yellow-sorrel, lemon clover, or more ambiguously and informally “sourgrass” or “pickle plant”.