Cactus attack power is too small to be practical. You start by planting a mushroom in the upper left corner, and then spray him with a small mushroom in the third column as soon as you see the zombie coming out of the fog. Generally, you hang up when you get to the front, and then you can act according to the situation. If there are many zombies in the early stage, you will put frozen mushrooms or destroy them. Usually you have to wait until the balloon hits the first wave. That should be no problem. When there are many balloons coming out and approaching the door, you will put a clover and blow them all back.
I played very hard. Give me some advice.