Substitute fertilizer for those who can't get the HVH fertilizer

[Citra]

Hi,

I've been reading HVH website for years for Hibiscus care and I've been following HVH suggestion to use high potassium fertilizer.  Since I couldn't get to the HVH special fertilizer, I tried to find a substitute of fertilizer with higher level of potassium.

The problem is, I've just visited the yearly Flora Exhibition here in Jakarta I get the chance to met the guy who has been taking care of the best Hibiscus Nursery for years in that exhibition and he told me to use a mix of Nitrogen, Phosphorus & Potassium with higher level of Phosphorus. 

Now I am confused.  Their plants is blooming much better than my plants so their fertilizer cocktail is working better. 

What can you suggest? is the climate also factor the fertilizer difference?

FYI, their cocktail is 1Kg of the standard 16-16-16 and mix it with 300Gr of GrowMore 10-55-10 for 50 liters of water.

Thank you

[Kyle]

Citra,
Listen to Charlie and Cindy's recommendations.   They have done the work and research for us.
16-16-16 isn't a bad fertilizer.   It's good for a lot of plants since it balanced and medium strength.   
Since his main fertilizer is balanced 16-16-16 the high phos booster may not be harmful yet.
Eventually the phosphorus will build up in the soil and slowly kill, unless he flushes often or gets a lot of rain.

Hibiscus don't really need special fertilizer.   They can tolerate lots of variations in fertilizer and ratios.
I never fertilized when I lived in Florida except for magnesium.    The sun/heat did all the work for me.   
They grew really well in sand for soil.     
 
Fertilizer is just 1 of the many things that plants need for photosynthesis. 
Sunlight,  time of expose,  temperature,  heat, soil, PH all play into factor. 
Temperature is a huge factor for hibiscus.   I mean huge! 
You can give your hibiscus the best fertilizer imaginable,  however if you soil is alkaline, or turns to cement when it dries,  it doesn't matter what type of fertilizer you use.   
Soil and PH are huge factors that determine if the roots can absorb nutrients. 

Plants can not absorb copper, magnesium, potassium, metals, and other nutrients!   
People don't understand you can't just toss metals and chemicals in the soil and expect the plant to absorb them up.   Some people think if I add more the plant will absorb more?   XXX!
The nutrients need to be broken down into readily  available forms  or chelated to help them absorb the nutrients. 
Even when nutrients are in a chelated form the plant can still struggle trying to absorb them.
Your soil needs beneficials to help break the nutrients down into more readily usable forms.     Little bacteria microbes in the soil eat nutrients and poop out organic nutrients that the plant can immediately absorb into the roots or save for later when they need it.   
If the PH of your soil is not in range the fertilizer isn't going to do much.

Your friends hibiscus may be blooming better because of the soil type and PH of the soil and greenhouse conditions.   
He is probally pruning his hibiscus as well to get them to be vigorous. 

I understand you might not be able to have soil shipped to where you live but you can make your own soil with what you have to work with.   
You can make your own hibiscus soil based on what's around where you live. 
Coconut husk, peat moss, humus,  compost,  kelp, sand, bird droppings chicken droppings, perlite, lava rock vermiculite in your area?
You could also ask your friend that grows hibiscus what type of soil he uses and ask what is the PH of his soil?  His soil is likely slightly acidic.       

If he is really competitive, he could lead you the wrong way and purposely give you wrong info.
Thought I mention that but hope someone doesn't do that.
Kyle