Hi @drnicko interesting plant. I've found this info on the web hope it helps apparently you should see flowers this year. http://www.enkivillage.com/how-to-grow-a-desert-rose.html I may need to find a white flower one 👍 Thanks for posting.
@lamaisonbleueoleron I've been using for a few years, so now have a small collection of 7! I use dual spectrum HPS, which give both blue and red spectrum for flowering and foliage growth. Some of my plants have never seen "real" sun, so they have to be gently eased in when going in the garden!! I think they're great, all my tropicals grow/flower all winter long including plumeria. I also growing mangoes, lychee, guava, Annona, eugenias, starfruit etc all under lights. Ps not had a fruit yet!!😎