It is difficult to provide an exact answer without knowing the exact species of plant, as the growth rate and size of the plant will vary depending on the species. However, as a general rule of thumb, you should remove the pup when it has reached approximately one-third of the size of its parent plant. That way, you can ensure that the pup has enough room to grow and flourish in its new pot. Additionally, make sure to bring the plant indoors in October to protect it from the cold winter weather in Maryland
.