Soft as a petal that falls from a tree, the more I dry the wetter I will be.
What am I?

Hello Ratan-ga,

Thanks for the fun question.

Soft as a petal that falls from a tree, the more I dry the wetter I
will be. What am I?

The answer to the riddle is a sponge or towel.

I found the answer in the Nancy Drew: Stay Tuned for Danger
Walkthrough

“Riddles for Jr. Detective level: 
1) I run all day and never walk, I tell you something, but I do not
talk!
What am I? .........Watch or Clock 
2) When you look at my face it is easy to see, you’re looking at you
when you're looking at me!
What am I? ..........Mirror 
3) Soft as a petal that falls from a tree, the more I dry the wetter
I'll be!
What am I? ..........Sponge or Towel” 
http://www.thinkage.on.ca/~dat/games/sol/ndrewstfd/ndstfd.html

This riddle can also be found at this website.
http://www.adventurecollective.com/cheats/nancydr1.txt


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Soft as a petal that falls from a tree


I hope you find this helpful and if there is anything that I've
written that needs clarification, please ask before you rate this
answer.

Best Regards,
Bobbie7-ga

Excellent!