Hi Jesse,
Are you using the latest version of Pocket Plants? The super plants is a new contents added in v2.1.2. If you are on the latest update, you will need to go to the ‘Quest’ section and send your residents off to explore. The residents will come back with lucky packs which may contain super plant pieces. Collect all required super plants pieces to activate and plant them in nursery super plants section.
Also, did you add friends from our FB page and forum? Friends added from these two sources are very competitive when it comes to completing friends orders. If you did add friends from these public sources, it’s best to add more to increase the chance to catch available friends orders. Please let me know if your Pocket Plants friends are from the personal circle and still having trouble to see their orders.