I read on a site that to get the fruit of life you have to delete all plants.I did and got nothing.How do I get the fruit of life?

I don't know where you read that, but it certainly wasn't here. You never have to delete all your plants to get anything in Plant Tycoon. You can find a lot of helpful resources in the Plant Tycoon Guide, or you can ask for specific help in the sticky post at the top of this forum.

I read it on reflexive in the spoliers.Boy was it a spoiler,its wrong

I found this place to be alot better than Reflexive's Tips and Hints Section. I get most of my games from Reflexive though. I just come here for info on LDW games. If someone here puts down the wrong info, it will be caught and corrected. Nobody here would have told you to delete your plants. I am so sorry that happened to you.

how do I get the fruiy of life?

Look here in the Guides Section.