Henna on wet hair??

I have one day to henna and condition. So, I was wondering if its okay to add the henna right after washing and conditioning, or must the hair dry first?

I have done the henna on dry hair and wet hair. I prefer wet hair! I followed the video that CurlyNikki has. It seems like with wet hair, my hair soaked up more henna and it feels more conditioned. It was hard for me to work with when my hair was dry.

I always do mine on wet hair.

I do mine on freshly shampooed and cowashed hair that is still damp...

I prefer to henna on wet hair not sopping wet but damp enough.