Biological SF

[Cat's Cradle]

I would second Bick's recommendation of Harry Harrison's Deathworld! It's a really good read, and the biology of the world is absolutely integral to the plot...it's a really intimidating ecosystem he has imagined here!

 

[TheDustyZebra]

CJ Cherryh's Cyteen trilogy, and the other Downbelow Station books are genetic engineering.

 

[psikeyhackr]

These are curiously opposite

No Blade of Grass by the English author Samuel Youd under the pen name John Christopher.

The Death of Grass - Wikipedia, the free encyclopedia

Greener than You Think by Ward Moore

http://www.gutenberg.org/files/24246/24246-h/24246-h.htm

The latter is funny more for the writing than the story.

psik