I can't remember much about this story, I think maybe the 1980s in the UK when I read it.
The memory:
A struggling colony trying to establish on a planet, a random assortment of hostile creatures but mankind was dealing ok with them.
There was rationing but rudimentary agriculture had began, however the rules (maybe from a controlling computer) didn't allow any useful vegetables to be grown, only flowers (decorative flowers only, no edible flowers).
Periodically new batches of colonists would appear, having been vat grown on the colony ship ...the original colonists called the newcomers "Ship Born" I think (but I'm not certain) that planet born colonists were subject to mutation.
I've been through the guidance and struggled to come up with anything else.