Sunny Knockout Rose | Yellow Knockout Roses | BLOOMS up to 9 MONTHS!!! Low maintenance. Drought tolerant. Sweet Fragrance Similar to Citrus The scent of your Sunny Knockout Rose will blow you away. It's a sweet aroma that fills the air... you can smell it up to 50 feet away. You'll want to plant these roses in high traffic areas- near the entrance of your home, around your patio, or even along your property line.