Let 5 colors be $\color{red}{ \text{Red}}, \color{blue}{ \text{Blue}}, \color{green}{ \text{Green}}, \color{orange}{ \text{Orange}}, \color{Black}{ \text{Black}} $
Florist have as many roses as your want of these 5 colors
We need to form bunch of half dozen (6)
$\color{red}{ \text{Red}}+ \color{blue}{ \text{Blue}}+ \color{green}{ \text{Green}}+ \color{orange}{ \text{Orange}}+ \color{Black}{ \text{Black}} = 6 $
using stars and bars,
$\large \binom{6+5-1}{5-1} = \binom{10}{4} = 210$