In the landscape 'Emerald' zoysiagrass Zoysia japonica x Z. tenuifolia is a desirable species for its dark green color and fine leaf texture. In recent years an interesting phenomenon has been observed where sections of recently established areas display different spring transition characteristics than areas which have previously established in ‘Emerald'. Older areas within lawns which were established to ‘Emerald' transition sooner in the spring than newer established areas. By surveying several lawns where this phenomenon has been observed and, sampling producer and retailer stock it may be possible to determine if ‘Emerald' is accurately being sold. DNA fingerprinting techniques were used to establish that genetic difference between these grasses exists in the landscape. Differences in phenotypic characteristics could be attributed to varietal differences. Therefore, educating the professional landscaper and retailer and then, identifying production fields with ‘Emerald' may protect the consumer from having grass cultivar related variation within the landscape. Through working with sod producers, professional landscapers, retail markers, and certification agencies information has been presented such that previsions are implemented to avoid the introduction of different species into existing stands of zoysiagrass.