In general, the adult yellow-margined box turtle can grow to about 20 centimeters, with an average of about 10 centimeters. Generally speaking, its size is medium to small. There are many factors that can affect the growth of the yellow-margined box turtle. First of all, genetic factors, if the parental genes are better, it can grow very large.
The second factor is the later feeding. Arrange a suitable environment, keep the water clean, feed more fish and shrimp in the feeding process, adhere to the principle of eating less and eating more, increase calcium, at the same time let it bask in the sun more, enhance resistance, you can make it grow better and bigger. However, it should be noted that in the process of breeding, we should not feed a lot of hormone foods because of the pursuit of rapid growth. Excessive intake of these foods will affect its healthy growth.
The time of closing the shell of the yellow-margined box turtle is uncertain, mainly depending on the breeding situation. Generally speaking, it is easy to close the shell after adulthood. The reason why it appears closed shell phenomenon is that there is a bone bridge between the tortoise body and the carapace, so when the limbs retract, they will drive the carapace to recover together, which forms the closed shell. If cultured properly, it is possible to close the shell in the seedling stage.