Plant Knowledge (PVZ2)

Plant Knowledge, the thing that is hiding. It will make your plants stronger... But they need to unravel the XP from it first to level up. The cards, that come from the packs. Sometimes these are bounty which have a chance to give you these, anyways there can only be one summoned. The max is 15 to stop peashooters becoming ridicously OP. Sounds interesting, huh?
 * 2 Ancient Packs
 * 8 Knowledge Packs
 * 2 Wild Packs
 * 20,000 Cash
 * 15 Gems
 * Plant Secret (gives 250 XP to every plant)
 * Rare plants (sometimes discontinued)
 * Free Plant Food (max 8 plant food)
 * Reserveable plants, such as you can place a Peashooter without losing any sun.

Write down your ideas below.

Note: Plant-Powered is the same as plant food.

Here are some examples:

1/6/11 - Giving a Wall-Nut plant food has a 2%/4%/8% chance to summon another Wall-nut above/below it

2/7/12 - Wall-Nuts now take 63/71/83 bites to die.

3/8/13 - Wall-Nuts cost 15/20/25 less sun

4/9/14 - Wall-Nuts have a 2%/4%/8% chance to have a crystal shield when plant food is given to them

5/10/15 - Plant-Boosted Wall-Nuts have a 5%/10%/15% chance of killing a zombie.