1. You'll need to visit the Moshling Seeds Cart and purchase seeds.
2. Next, visit your Moshling Garden via the MAP or by clicking on the icon in your room.
3. When you arrive in your garden, the auto-planter will suggest seeds to plant for different moshlings.  When you want to try again for a particular moshling, you can click on the "change" button and have a look at whats there.
4. Plant the right combination and a Moshling will appear! Flowers take several hours to grow, so be sure to check back to see what's happening in your garden.

TIP: Plant the wrong seed? Don't panic! Simply dig it up by clicking on the seed spot and then plant a new one from your Moshling Garden inventory.