There are some plants, that lives 2 years. Such as carrot, beetroot, onion.
At the first year they are growing from seeds to edible roots, what we are eating. The next year, if you will plant a carrot, beet or onion - it will launch a peduncle that will bloom, and then you will get seeds. After that this after that roots become inedible.
So, why dont make this system in haven?
When, for example, planting carrot seed you get carrot. After this, carrot can not be planted for multiplying, it will be only for getting seeds from it.