I've found that the tiny pots retard plant growth and they stay smaller longer. Some of the ones I put pics of in the "smallest plants" discussion have been that way for 1-3 yrs, depending on which pot. "Bad dirt" helps too, I put yard dirt in the tiniest pots to keep them from being more vigorous, and a little more shade.
Naturally miniscule plants and plants with arrested growth are somewhat related in conversation, if one has an interest in manipulating plants that would otherwise get larger, and with the knowledge that one could end up with a much larger plant over time. Looking up pics of names suggested should help you realize the category under which each suggestion fits. If you see a really big example, you'll know a baby won't stay small for long if growing vigorously/normally.
