This cactus is worked in back and forth rows, always in the back loop to create a zigzag effect.
Crochet hook 3 or 3.5 for the cactus, 2.5 for the sombrero and the potting soil.
Because I imagine this cactus in a desert, I added a little sombrero in stead of flowers.
Of caurse you can skip the sombrero and add flowers.