I've made these. How long have yours lasted though? because whenever I use electrical tape the tape eventually stops holding and the petals "unfold" a little. That's why I like duct tape better.
To the people that are confused, this is how you make the basic petals (imagine the white part as the sticky side of the tape) But in this drawing I made it look like you should use a long strip of tape for each petal, which doesn't look as good as using a shorter strip. Oh well I'm not a professional illustrator but you get the idea
Then you can overlap the bottom part like she did in the picture in the first post.