Mutant Seeds?
Only visit neighbors with a spade/shovel count going, tap their mutant walking corn usually found on roads. Don't drop seeds in towns without a spade count. You get more seeds from tapping mutant corn...
Forum Discussion
You're both very welcome! :) I don't think there is a way to tell when you've got them all. However, you do get a notification when you get all the other 'walking weeds'.
