I assume by seedlings you mean small plants? We took the seeds from some of the tomatoes and peppers we bought, dried them out for a week or two, planted them in 'black earth' and lo and behold we have many tomatoes and peppers. Did the same with cucumbers, water melons and honey melons and they have all grown well and produced fruit. Even our lemon trees are self sown...where can you buy tomato seedlings in SD???
and other seedlings for that matter...peppers..
Me too planted 4 avocado seeds and it workedI planted the seed. Today I have a huge tree,and lots of "FREE" avocados,just like the one I ate eight years ago! Same goes for a mango,but I am still waiting for the "fruit" of my labor!