A. To prevent crops from withering, make sure to harvest them as soon as they are ready. You can also set reminders on your phone to check the game at regular intervals. Additionally, consider planting crops that have longer growth times when you know you won't be able to play for a while, such as wheat or corn, which take less time to grow and can be harvested quickly.
B. If you are unable to check the game frequently, consider using the 'Farm Pass' feature, which allows you to get some benefits that can help manage your crops better. However, be mindful of the cost associated with it.