Hoping for a nudge in the right direction.

Summary: I work a Nursery and have been teaching myself Google Spreadsheets to help with organization. I've come along way but find myself stuck on this function I'm trying to do, and what would be useful throughout my project.

There are multi areas that have different feeding/watering schedules. What I'm trying to achieve is to be able to change the schedule and have it repeat down column B for all the dates in column A.

Here is a example sheet that I set up. This is a small piece of a much bigger project that I have been working on for the past 6 months.