We used $10$ and $5$ for $15$, $10$ and $6$ for $16$, $10$ and $2$ for $12$, $10$ and $9$ for $19$, $10$ and $4$ for $14$, $10$ and $1$ for $11$, $10$ and $7$ for $17$ so we did not use $10$ and $3$.
The flower number $18$ has no butterflies. It needs a $10$ and a $8$.