as she walked eagerly from one lot to another , sarah noticed the plants transformed themselves in response to the different conditions of terra two , they were n't radically different from the species they had brought from earth but the redhead 's endless dedication saw the little changes - a bluish hue in the green of the foliage , due to the lightness of the soil , the stronger ridges on the stems of herbaceous plants , developed to better support their much larger size , the completely new cultivars that emerged on their own , perfectly adapted to the climate of terra two .