Reach Gardening Skill level 10
Use the computer to search for rare seeds
Buy seed packets and look for Cowplant Berry
Fish for rare plants and collect Cowplant Berry from splicing
Splice plants to create a Cowplant Berry
Plant the Cowplant Berry in the ground or a planter
Wait for it to grow into a Cowplant
Complete the Space Mission or explore the Rocket Ship for a chance to find a Cowplant Berry
Use cheats to add a Cowplant Berry to your inventory
Enter build mode and search for Cowplant-related items if available in your pack or expansion content