"Sunflowers"

The “Sunflowers” series was first introduced that March 2010. They had a bright yellow border, with 110 total cards: 45 common cards, 55 foil cards, 10 character cards.

The theme of this series was about Emma finding Herd Sunflower. The story cards tell the story of this, and the card are mainly members of this herd.

In French, this series was known as "Fleurs de Soleil," and in German, "Sonnenblumen."

Horses
This list is based on the official U.S. checklist.
 * Autumn
 * Beran
 * Bluebell
 * Bluefiddle
 * Briar
 * Buttercup
 * Calyx
 * Camellia
 * Cattail
 * Cayenne
 * Ceratos
 * Cinnamon
 * Dewsparkle
 * Dowager
 * Fiona
 * Flora
 * Foxglove
 * Foxtail
 * Generosity
 * Hawthorn
 * Jewel
 * Larkspur
 * Lavender
 * Lotus
 * Nike
 * Nutmeg
 * Oracle
 * Petal
 * Reed
 * Rosebriar
 * Saffron
 * Seraphia
 * Shasta Daisy
 * Soot
 * Snapdragon
 * Sunflower
 * Tarragon
 * Thunder
 * Twig
 * Violet
 * Waterlily
 * Wings

Promo Cards
These are horses that were included in promo images or cards, but were never officially released in this particular series.
 * Aster
 * Fairybell