There are spring mushrooms, grains can have two harvests, etc.
There are a bunch of things to consider when creating ecosystems; for example, I just wouldn’t let grapes grow under New England’s skies, because they yearn a temperate/warm climate. Since this system is not wrapped around fictional flora or fauna (at least the off. canon isn’t) it’s much heavier to predict everything about individual items.
Another thing - try “Everything’s Suddenly Blooming!” once the carbon-monoxide/dioxide emission hit bottom low, and now you’ve got only armies of evil to breathe and eat those berries with. 