Colocasia esculenta ‘Jack’s Giant’ Lend a big splash of tropical drama to the garden. Growing to at least 5 ft. in height and a plant width of 5 to 8 ft. it truly is a giant. Jack may even want to surrender his beanstalk! The glossy, massive, heavily-ribbed leaves are a rich blue-green lightening to chartreuse around the edges. Site the corm so that the plant will have sun to light shade. It thrives in consistently moist soil enriched with organic matter. In winter it needs drier conditions so the soil should have excellent drainage.