Sunny Knock Out® Rose TreeYellow Blooms + Carefree Knock Out Growth in Tree Form Why Sunny Knock Out Rose Trees? Setting the standard for carefree color and adaptability, the Knock Out Rose Tree has raised the bar for disease resistance and carefree upkeep. Its got all the hardy, reliable growth of the Knock Out shrub in an even more versatile growth habitand rich yellow blooms for up to nine months. The Sunny Knock Out Rose Tree can be container planted to place beside