‘Knock-Out’ tree rose Posted Monday, April 27, 2009Friday, May 17, 2019 Jess Yarnell The ‘Knock-Out’ tree rose has a nice new cane that just burst into bloom. Pretty! 'Knock-Out' tree rose Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on Pinterest (Opens in new window) Pinterest Click to email a link to a friend (Opens in new window) Email Click to print (Opens in new window) Print