For a comparison between direct sowing and transplanting you really need an on site experiment and to observe the results. Try both approaches and see which works better in your situation. Personally I usually prefer to sow seed rather than deal with transplants as I've had better success with this approach. I think that people
should do whichever they prefer and get better results with. Sometimes the benefit of transplants isn't so much in the technique but rather the increased observation, as flats inside often get more attention for germination requirements. This can provide valuable learning about what conditions are required so that they can be created naturally outdoors for sowing seed in future experiments.
I really like
water lilies in my climate because they decrease evaporation during the driest times of year, help stabilize the conditions in aquatic systems, and have such beautiful blooms. Cattails are another great plant as they provide a tremendous number of resources, from food to down insulation to arrows and material, while also regenerating the water. Currently I am really fond of Nero Aronia because of the high antioxidant content (I believe the highest known?) and for being so vibrant in such harsh conditions. I'd say that I even like the taste! The fig is such a great specie, I am quite fond of growing them in Montana, and peaches are one of my favorite fruits. Berries of all kinds because because they are delicious (and they make pie!).
Black Locust is another great plant, a great pioneer tree with rock hard rot resistant lumber. Some plants that I would like to learn more about and start cultivating; Kaniwa - Quinoa family but heartier and higher limiting amino-acid content, Chocho - an Andean lupin with an oil content higher than soy, and Inca berries - another delicious berry! Ice Cream beans are a most amazing
gift of a tree, a nitrogen fixing pioneer plant whose seeds are coated with an ice cream like coating, as is Cacao, the seeds are surrounded with a sweet and sour coating. My favorite fruit to eat is currently Caimito. I could keep going for days but there are lots of other questions to get to still. Notice how the reason quickly goes from function to taste!
I believe that most of the resources that we have available can be used to heal the earth if people think ahead, think about the future, and listen to the natural world. Even oil
wells can be used to heal the earth when you think about it on a grand scale.
Grass is certainly a good tool to use, my understanding is that when management properly grasslands can sequester the most
carbon into the ground. When grasses are grazed at flowering height there is tremendous
root die back that is cycled in the soil. This puts a lot of organic matter back into the soil. The system grows soil.
I will say that I don't believe grasses are the best way to
feed humans though. Obviously grasses have a role in grazing systems but after seeing
Sepp's systems where animals are fed with agroforestry systems this seems like the happiest healthiest animal to me. It seems like the final stage of succession for a Holzer
permaculture farm.