Board Thread:Wiki management/@comment-25089892-20150613163714/@comment-25154254-20150615000451

Just a note, this is not totally random. There are three types of number of Plant Food on each level, following the three types of difficulty and number of zombies they spawn. If you notice carefully, in BWB - Day 16, there is always a glowing Buckethead.

I will show you the clear examples: Keep playing, I am 100% sure you will get these results, just one of three numbers above each level. If I have time, I will show you the actual zombies that will glow or always does. Otherwise, like Dung Dinh Anh said, there are certain numbers of Plant Food. I am sure that THP was once found this while working with me about waves.
 * BWB - Day 28: 5 - 4 - 1 (There is always a glowing Conehead)
 * FC - Day 16: 5 - 4 - 1
 * LC - Day 16: 5 - 5 - 5 (Not sure?)