Which species is this flower seedling?

Question

Who can help me with identifying the plants shown in the picture below (on the left).

I grew them from large brown seed contained in a "Flower Seed Mix"

_{Click photo for full size}

Answer 1

Judging by

• the seed description,
• the tendency to climb and
• the small tendrills at the top and
• the flattish stem

together with fact that it's often in "seed mixes", this is most likely a Sweet Pea.

Plant it near a fence or other structure where it can get a grip with the tendrils to climb or provide some other kind of support.