Trifoliata poncirus is extremely easy to grow. It sprouting stage is so vigorous then slow down after a couple of months. The pace of growth also varies between seedlings from different seeds. One seed might grow up to 4 seedlings, but only one is vigorous. I threw a bunch of seeds from diffrent poncirus fruits into a garden bed, and there was one that was extremely vigorous that grew out doubled the size of other seedlings in the same bed.
Poncirus had a very deep tap root just as other citrus trees. Many claimed that pocirus does not have tap root, but it does. I've dug up the most vigorous seedling and put it in a 1ft deep pot to observe the root in later months. I dug it up a few weeks ago and noticed that the roots grew out of the container through the drain hole at the bottom. I took the roots carefully out of the container to observe further. I found that the tap root was not in straight form like other citrus tap roots but curled up; however, the tap root went very deep into the soil, at least 1 ft deep as a young seedling. The mentioned seedling was almost 1 ft tall at the dug up time.