Abstract: Sweet potato (Ipomoea batatas L) is an important tuber crop worldwide. It is the second most economically important after Irish potato in Sub- Sahara Africa. In Kenya, it is an important food crop alongside maize. Sweet potato has gained popularity among many farmers in Kenya due to its ability to give satisfactory yields under adverse climatic and soil condition as well as under low or no use of external inputs. However, its yield potential of 20-50 t/ha of root dry weight is yet to be exploited by farmers due to abiotic and biotic constraints. A Participatory rural appraisal and survey was carried out in central, eastern and western Kenya in August to October 2012 in order to understand and validate problematic weeds of sweet potatoes, methods and costs of control, with the aim of conducting research. Results indicated that hand weeding using hoes was the most popular method farmers used to control weeds. And that most farmers across the counties spent between Ksh. 2,000-2,999 to control them.