chick chick BOOM (WiiWare) "Knockout 50 chicks in Pro mode!" Achievement

I did it on the graveyard arena because the red ghost has great synergy with the red plant. My general strat was to spam plants and draw a line at the very base of the plant's head to keep the opponent from interrupting its attacks at all. Sometimes it works, sometimes it doesn't. I could have done better. I noticed I refreshed plants a lot when I didn't need to, because I was so focused on getting all my attacks out asap.