"I believe it was mentioned before, but I can explain that again. Your only job is to grow, collect and create as many plants as you can. You will be provided with a suited shelter and terrain that would allow you to accomplish this. All that you grow will be given to Severus Snape, your former Potions Master, so he’s got a healthy supply of various ingredients, if not to Severus, they are being shipped to wherever they’re needed, including here in the Nest.