<human>: What is the best way to: How do you choose a container in which to grow a cranberry seedling?

OPTIONS:
- Measure the size of the seedling’s root ball and purchase a pot that is at least double that size.
- Measure the size of the seedling’s vines and purchase a pot that is at least double that size.
<bot>: Measure the size of the seedling’s root ball and purchase a pot that is at least double that size.