Color your garden happy By Norman Winter - Tribune News Service This Eastern Tiger Swallowtail likes yellow too as it visits Superbells Yellow calibrachoa. Norman Winter/TNS If there were a color that represents happiness in the garden, it would have to be yellow. One of the three primary colors, it has the power to evoke hope and excitement. When the forsythia breaks forth in the early spring, it not only catches your eye, it invigorates your step. Winter is over and a new season has been born. On the other hand, there is a reason the school bus is yellow, a motive behind so many highway sig...