Image of a Sativa and Indica cannabis plant side-by-side (Sativa plant on the left, Indica plant in the middle, the mostly benign Ruderalis on the left): image via mmj-guide.com. You can see in the photos above Sativa plants tend to be significantly large while Indica plants are shorter and wider.Indicas are very effective for overall pain relief and is often used to treat insomnia for many people.ou can see in the photos above Sativa plants tend to be significantly large while Indica plants are shorter and wider. Indicas are very effective for overall pain relief and is often used to treat insomnia for many people.