What plant is the most useful one?

[ceranolas]

roses people, just roses.

 

[baywax]

The money tree. Oops, Art got that.

How about the fabled "Tree of Knowledge".

Seriously, there is the possiblilty to hybrid a plant with every other known plant on the planet.

In fact they used to hybrid tomato plants with cannibus plants so they could hide them in a crop of tomatos.

Anyone for a BLTHC?

 

[HungryChemist]

Okay, it's got to be Coffee for me!

 

[Ivan Seeking]

Soybeans...

 

[Ouabache]

http://www.ecology.com/dr-jacks-natural-world/most-important-organism/index.html - they produce between 70 and 80% of the oxygen we breath. definitely a keeper..
denverdoc good job mentioning phytoplankton.