I picked up 2 mamey sapote fruits this week from my local specialty grocer, and oh, boy! So. Delicious. But, I'm a plant nerd, and I can't bring myself to toss the seeds when I could grow them instead.
Anyway, I wound up with 5 seeds:
1 slightly split naturally inside fruit
4 totally sealed shut
After checking online, it appeared the seed coat needed to be split for proper germination. Recommend method was squashing the seed between a couple 2x4s. After doing that to two of them, and causing both to fracture badly enough for a piece of the shell to come off, I concluded that maybe I should try a different method of scarafication. So I sanded the edges off of the other 2 until the shell was thin enough that the pressure inside the seed caused a natural crack to form.
So now I had:
1 naturally cracked seed
2 manually cracked seeds
2 sanded seeds with natural cracks
Soaked all 5 for about an hour in a bowl of water. This caused the cracks to get bigger on all 5 seeds.
Planted the 2 manually cracked seeds in 1/2 gallon poly bags with a loose & draining but moisture-retentive soil.
Put the other 3 in wet paper towels in bags like was shown in several of the germination guides I saw online. This is how I sprout my mango seeds, so it seemed legit.
All 5 seeds did get a quick spray of an organic plant fungicide to deter mold.
Now we see what grows faster!