Playing on multiple devices
You can install Flower Garden (or Flower Garden Free) on as many devices as you want and play it on all of them. However, the state of your garden will be different in each device. That means you’ll have different flowers in each of them and you’ll need to take care of them separately.
Any gardens or seed set you’ve purchased will also be available in all your other devices. You just need to use Restore Purchases under the Flower Shop options (that doesn’t apply if you purchased them with credits). Fertilizer and Color Dust counts are separate for each device and will not carry over.
You can always transfer your full garden state, purchases, and fertilizer to a new device though.
If you log in to the same Game Center account on all the devices, achievements will be synchronized between all your devices too.