Survival Mode Strategy
Playing Survival: Pool (Hard) with a very basic defense and tons of Marigolds can result in lots of gold coins as well as chocolates and plants. The same strategy can be used for Survival: Pool (Easy) if Survival: Pool (Hard) is not yet unlocked. The Tree of Wisdom tells us that plants drop most in boards with pools, so this is an excellent and easy way to get gold coins and plants.
Recommended plants: Sunflower, Potato Mine, Pumpkin, Magnet Shroom, Gold Magnet Shroom, Lily Pad, Melon Pult, Marigolds, Spikeweed, Rockweed, Coffee Bean, Twin Sunflowers
Survival: Pool (Hard) can be easily defended with a row of Winter Melon Pults, and the last four boards can be easily played with four full rows of Marigolds. The first order of business is to get two columns of sunflowers down in every row. Defend them with potato mines until you can afford Melonpults, and place them in the pool before the lawns. They will be all you have defending your pool lanes. Melonpults do area of effect (AoE) damage, so make sure that you leave the bottom rows for last.
Put a Gold Magnet Shroom in row 4, column 5. That is right in the middle of the entire board. It will be best for picking up the gold coins that the Marigolds toss out every now and then. Marigolds are on a very long timer, so the earlier you can put them down, the better. In the first stage of Survival: Pool (Hard), make sure that you get all your Sunflowers planted, and make sure that the first column all gets turned into Twin Sunflowers. You do not want to have to take the Sunflower or the Twin Sunflower card in stage 2 of Survival.
From then on, make sure that you take Marigold as your first card and plant one in front of your melon pults as soon as you are able to do so. Again, they have a really long timer, so it will take at least 2 boards to completely fill the space available. Please see the picture for the final layout.
Estimated Haul: Between 6,000 and 8,000 gold coins. Sometimes a couple of diamonds drop, and usually you will receive one or two plants. This is very important for the fastest way to make coin in the game.