阅读唐代诗人杨巨源的《城东早春》然后回答问题。

                                                                                                                                   城东早春  杨巨源

                                                                                                                  诗家^①清景在新春，绿柳才黄半未匀。
                                                                                                                  若待上林^②花似锦，出门俱是看花人。
     【注释】①诗家：诗人。②上林：古代皇家园林。