scarification

I recently ordered some Brazilian rain trees (10 seeds) and wanted some advice on a couple of things. I mainly ask because I have had a hard time finding information (the seller sends info but I would like to get info ahead of time to prepare). 1) Soil. I have read a mix of things, such as using...

I have two questions: 1-) As I am in the Southern Hemisphere and my seeds will arrive any moment, I feel more secure if I wait for our Spring here, wich is in September. Now is the last month of summer, I guess too late for the whole process. Right? 2-) Most of my tropical seedlings needed some...