watering adeniums there is no direct answer the best is to say when they are growing and or blooming (warm/hot summer) you can water much more. If it is getting cool (70 and below) you better start cutting the water AND fert.
feeding to much is not good period no madder what anyone said it actually ends with a weaker plant that can not fight off pest and disease. This is said by Professional growers in India and Thailand PERIOD.
you can feed more when they again are growing and flowering. Melissa said and i agree if your stems are getting real green and kind of tender you are feeding to much nitrogen ( first #) that is one reason she has found a 1-2-3 like 10-20-30 is better (with feeding easy to remember first is for foliage, second is for flower/fruit, third is for root strength)
I feed all my plants with ( everyone be prepared to be shocked ) the cheapest fertilizer i can find at home depot and it so happens to be 15-30-15 time release BUT i feed according to what the plant is needing i dont just do it every 2 weeks or even every month. i do mix with water and dilute it for small tender plants and use that way for seedlings. but with over well lets just say 2 or 3 BOAT loads of plants I can not afford expensive fert. i DONT ADVISE PEOPLE TO USE IT BUT I DO...you know the saying do as i say not as i do
I do like to let my adeniums dry 90% before i water but here in Florida in the summer Mother nature is doing most the watering i just watch for un desired results and for me the key is full sun and very fast draining soil mix like very fast
this is my thought
others will also chime in with theirs
mike