Question
I have collected many fruits of Philodendron bipinnatifidum. Those are turning from cream to yelow. I hav read that inside the pulp the seeds are very minute, but I could not locate which one is exactly seed. How  and when to sow seeds  of Philodendron.

Answer
Hi Bharati,
Take a look at this link and if it isn't what you're looking for let me know.  I don't have experience with this particular plant as it is a house plant here and not used outdoors to my knowledge.

http://www.fshs.org/Proceedings/Password%20Protected/2006%20v.%20119/FSHS%20119/...

the flower is pollianted by a beetle which may or may not be native to your country, so you may have to hand pollinate.  The flower will not produce seeds without natural or hand pollination.

I hope this helps.
Tom