This question was recently asked of me and I thought perhaps others may have the same question in their minds, so I make a stab at answering it here:
Growth of newly formed propagules varies greatly depending on the environment they are given.
Most often I produce crops of tiny new plantlets and let them stay small (needing no attention and little space) until I am ready to have them grow-up. For me the easiest way to get them to groW is to transplant them into new media that contains a quantifiable, yet low level of nutrients, be sure the media is moist but not wet, seal them in a ziploc bag to ensure moisture levels stay nearly constant, and place them under fluorescent lights for at least 16 hours/day. They usually start sizing-up very quickly with this treatment.