I'm planning a wedding based on lavender, eggplant/deep royal purple, and white. While looking for bouquet ideas, I fell in love with a bouquet containing dark purple roses, white calla lillies, and lavender blossoms. I am also thinking of adding lavender colored peonys. The problems is, dark purple roses and lavender peonys DON'T actually exist in real flowers apparently

Is it tacky to use some silk flowers? They have gotten a lot better at making them look real with new "feels alive" material. The other real flowers will help add scent and I'm hoping people wouldn't notice the difference but even if they did...does it matter? is it okay to use silk (which I also hear are cheaper) if that's the only way to get the true look I want? Or should I just suck it up and look for other purple-ish flowers?