This is a great feature idea we're working on! Many folks in our plant parent community share the responsibility of caring for their plants with someone like a housemate or a partner or would like to provide context and guidance for plant sitters when they are out of town.
For now, you can share your plant cards which include the average time between waterings and the last watering date for each of your plants. You can do this by tapping the share icon at the top right of your plant and choosing a method to send it to someone.