Jazzo, I reached Arthuruim Ball Cactus first pop. I also got 2 plants that I didn't have and I only planted 3 Citrus Ball Cactus seeds

I am doing it the slow way, growing other plants to sell to finance my experiments along with the 3 seeds to mutate.
Planted 3 Arthuruim Ball Cactus next, self polinated one plant just in case then used the Mutation Fluid on the other 2. I got Arthurium Glaber first pop then another plant that I didn't have - a Venus Ball Cactus

Your guide is surely good enough for the Guides section in my opinion.
Thank you for your clear instructions and the added income that I am getting from the bonus plants
