I have some plants that I have started growing indoors, specifically jalapeño peppers and Walla Walla sweet onions. I am worried that the containers I have them in are too small for them to develop well while still in their containers; however, their root base is nowhere near developed enough to hold the soil together when I transplant them. To add to the situation, I planted them in very loose potting soil, which won't stick together on its own at all.
I am wondering if there is any way I can safely transplant these plants without having to wait for the roots to grow in more.