No. Adeniums don't need extra phosphorous to bloom.

9-3-6 is too high in nitrogen for adeniums. Balanced or slightly higher middle number.

So you say it is missing what and needs less nitrogen? I am just reading old posts. But am hooked, What do you and others use?

Marcia,

This is a part of one of Dr. Mark Dimmitt's articles. There are many of them if you search on Aridlands or other sites.

You are going to find many conflicting results in search for "what" fertilizer works for your Adeniums. I am not a scientist and try to understand and take in what I read. Dr. M. Dimmitt is world renown and he has studied and grown/hybridized many cultivars and most of the introductions to US and/ North America. His studies are based on proven and tried and true results along with his co workers and Authors of a Marvelous book.

Adenium: Sculptural Elegance, Floral Extravagance.

This book is a true inspiration and must have for people growing these.

Feeding

Adeniums also respond well to regular and generous fertilizing. I use slow-release fertilizer in my potting media and inject my irrigation water during the growing season with a balanced fertilizer such as 20-20-20 plus micronutrients at a concentration of 200 ppm nitrogen.

Inadequate watering and feeding are the primary reasons adeniums have been regarded as slow-growing. Generous culture produces literally unbelievable results. (An eight-month-old plant splitting a six-inch pot that I entered in the seedling category at a CSSA show was disqualified by the judges because they didn't believe it was less than the limit of a year old.) Specimens several feet tall and wide in 18-inch containers can be grown in only three to five years (Figs.1, 2) and sometimes even less.

Adeniums seem to require high nitrogen for both strong growth and copious flowering. For one year I used a low nitrogen fertilizer (2-10-10) on most of my mature adeniums in an attempt to thicken their stems while minimizing further elongation. Not only did the low-nitrogen plants not thicken appreciably, they also flowered poorly that year. (Well-fed plants flowered normally.)

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Talpa, has many articles within the Gardenweb/Houzz site and I would definitely search out his articles using the Search bar at the top of page. Use when in the Adenium Forum and you will find an vast amount of articles.

I have always been of the understanding that Adeniums, Do not require high levels of "P" as you will see in many Bloom Booster fertilizers as with Orchids and many summer Annuals.

I started using the Dyna Gro 9-3-6 & Dyna Gro 0-0-3 through Information from Laura and I have to say, I am definitely pleased with what I see from using it.

Rick

I have read a lot Taipa's posts. Very interesting man. The only place I can get Dyna Gro is online or at a Bonsai store. and for some odd reason a store here called Kmart has it cheap,

I will look into reading more Dimmits since I just found his site. I called UC Davis and their library has his book. I will be going down to the valley to their arboretum, That should be blooming soon.

Great info as always. Thanks .