Since I am unaware of any Garden Warfare game for OSX, I suspect you posted in the wrong forum. Here is the (WinTel PC) game requirement rundown:
Plants vs. Zombies Garden Warfare
Required: Internet connection required to install and play
DVD-ROM: N/A
OS: Windows 7/8 64bit
Processor: Intel Core 2 Duo @ 3.0 GHz
Video Card: NVIDIA 8800GT, AMD/ATI Radeon HD 5750
Sound Card: DirectX 9.0c
Compatible Memory: 4GB RAM
DirectX: 10.0+
Hard Drive: 15 GB
Input: Keyboard, Mouse or Dual Analog Gamepad
Recommended System Requirements:
Supported OS:Windows 7/8 64bit
Processor:Intel Quad Core / AMD Six Core
RAM: At least 8GB RAM
Hard Disk: 15 GB
Video Card: AMD Radeon 7870 3GB or Better / NVIDIA Geforce GT660 3GB or better
DirectX: 10.0+
Sound Card: DirectX 9.0c Compatible
Input: Keyboard, Mouse or Dual Analog Gamepad
