Look for orchid seedlings up to 3 years after the seeds have been spread. If orchid seeds have received inconsistent or minimal care, it could take them that long to germinate.
Identify orchid leaves. Even as seedlings, orchids grow leaves that are recognizable: long, spear shaped, bright green and firm. The leaves on an orchid seedling will look like miniatures of an adult orchid's leaves.
Identify orchid roots. Once an orchid seedling sprouts and begins to grow, its roots will become evident. Roots are smooth, light brown and often grow up out of the potting medium.
Identify orchid shoots or flowers, if they're evident. Orchid shoots are long, flexible shoots, with flowers blooming along the top. The shoots generally don't appear until orchid plants are older.