Tropical Runtz Strain Tropical Runtz, also known as “Tropical Runts,” is an sativa-dominant hybrid weed strain made from a cross of the famous Runtz and Tropic Truffle. The effects of Tropical Runtz are reported to be more energizing than calming. Reviewers on Leafly who have smoked this strain say it makes them feel uplifted, happy, and talkative. Consumers find this strain ideal for social