Maybe it's just me, but I had the darnedest time trying to remember what seed scarification and seed stratification meant, and which seeds needed which treatment before planting them, when I first started gardening. Seed scarification and seed stratification were the seed starting equivalent of its and it's. You may see its and it's misused here on this garden blog from time to time. Fortunately for my garden I've pretty much mastered scarification and stratification.
Seed Scarification