Gold magnet
The Gold Magnet costs 50 sun.

Gold Magnet is a plant that collects money for you. It works well with Marigold and they are really useful in Survival:Endless for collecting money because you will be so busy dealing with the zombies, you wouldn't be able to collect all the money dropped because they is a very high density of zombies. It should be noted that if you are going to upgrade a Magnet-shroom into a Gold Magnet during the day, you shouldn't waste a Coffee Bean on it to wake it up because once upgraded, it will instantly wake up. (Note that this doesn't work with Fume-shrooms.)