OSO EASY&reg; Happy Smoothie Rose - THORNLESS - DISEASE RESISTANT - Proven Winners Oso Happy Smoothie Rosa 'Zlesakpoly3' PPAF Hardy Zones 4-9. Thornless. Hot pink, single blooms throughout the season. Bloom Time: Early-Summer to Frost, strong rebloomer Size: 2-3 feet mounded-arching habit Size Shipped: 4" pot