With fans far and wide, cacti and succulents come in myriad shapes and sizes too. These firm favorite of Instagram influencers are perfect for adding greenery indoors, and can add structure and detail to outdoor spaces as well. Smaller plants are companions for 'generation rent', since they are easily moved from place to place. Generally low-maintenance, being "plant mom" to one or two of these tiny plants often starts a life- long fascination, and an ever growing horde.