BUG: Omni Plant Troubles

Problem

1. Can't Order Onmiplant Seeds on the Mailbox
2. Can't feed Onmiplant

Solution

1. When you get the chance to order them, cancel the interaction while they are on the way to do it. The Seeds should then be ordered from where ever the sim is standing and you will get your seeds the next day (credit to Poliwag)
2. Probably caused by too much stuff in your inventory. Try getting rid of some or use another Sim with less stuff in his inventory to feed the plant.