There's a seed catalog in the Plant Tycoon Guide that shows all of the seeds. The Nox Orchid is very easy to make if you saved seeds from your other Magic Plants and your starting plants. You need only cross a Rosaceae Fern and a Spotted Reptans to get the Nox Orchid. If you didn't save any of those seeds, the supply shop gets new seeds every day, and you might get lucky.