Act now! Rids your lawn of pesky weeds... and Peashooters and Sunflowers. Also Wall-Nuts.
Strategies
With
Weed Spray is simply a cheaper variant of The Chickening, but instead destroys weaker plants rather than damaging them, allowing you to easily clear the board of plants with low strength. However, unlike The Chickening, Weed Spray will leave all plants with 3 strength or more unharmed, so its usefulness declines as the battle progresses, when more powerful plants can be played.
The best time to use this is when your opponent has an army of powerful yet, strength wise, weak plants such as Shroom for Two. Spineapple can be countered with Weed Spray if no plants have been buffed. This can be detrimental towards plant heroes such as Nightcap, Solar Flare, and Wall-Knight who rely on a good early game or good defense. You can also pre-place zombies so your zombies have a path to hit the plant hero. Never use this on a single plant though, unless you only have this in your hand and need it gone immediately. If you catch that problem regularly, Rolling Stone is a good idea in your deck.
Against
If your opponent did not spend their brains on the third turn, try not to place some of your plants with 2 or less on the first three turns, as your opponent may use Weed Spray to destroy most of them, wasting a lot of your cards in which may overwhelm you in the late-game match. As a Mega-Grow plant hero, you can try to buff your plants with Grow-Shroom or Fertilize, as they may greatly help you to defeat your opponent easily, giving them a high pressure. However, be aware that plants without strength can still be destroyed by Weed Spray, if you buff that plant via Grow-Shroom.
Gallery
Weed Spray's statistics
HD Weed Spray
Card
The player earning Weed Spray after completing the 8th step of Rustbolt's Hero Quest titled "Can O' Destruction"