Unable to use Bouquet Magic?

I was in a match using a Meowscarada ex and I was unable to use the Bouquet Magic ability despite having a basic grass energy in my hand, and with nothing on the field that should have affected it - the opponent only had an Unown V with a luminous energy attached. Before trying to use the ability I had a confused silver tempest venonat in the active and manually retreated it to the bench.