Cactus in the office, sitting on your desk, are very easy to maintain. Especially if you have florescent lighting in your office, as many do. I've always thought a cactus or two, sitting on a desk is just too boring for me.. no offense. You could have the cactus and a couple other plants. You can't forget to water the plants, they are sitting right in front of you, 5 days a week. That's really how I got my start in horticulture, and my love for plants and indoor gardening, started from one pothos on my desk, over 20 years ago. That plant grew all over my desk and eventually outgrew my desk, I had to take it home. Once I got it home, the plant began to grow all over my wall in my tiny little den, it began to grow around the corner, toward my bedroom, in the efficiency apartment that I lived in. That was the beginning of my love for plants, now I have about 60 in my home and would have more if I had a couple more rooms with more sun light ..
Come on, you can do better than a cactus.. we'll help you keep your plants watered ..