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Old 05-13-2018, 05:39 AM
 
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Witnit, Yes, refer to gemstone1‘s previous link:

Hidden Valley Hibiscus - Hibiscus Feeding & Fertilizing

“Phosphorus is another important issue with hibiscus - hibiscus do not tolerate phosphorus well, and in high doses, it will slowly damage hibiscus plants over time. One of the most common mistake novice hibiscus-growers make is to use "Superbloom" or "Bloom Booster" fertilizers. These products contain extremely high proportions of phosphorus and are very damaging to hibiscus.

We did a careful trial of phosphorus some years ago at HVH, in order to find out what the optimum levels of phosphorus would be for root and flower development. We intended to gradually increase phosphorus with each watering over a period of time, expecting to find improved blooming. Instead we watched the hibiscus go downhill within a couple of weeks of increasing phosphorus! It was shocking how quickly and how severely the phosphorus sickened our plants!

As the trial continued, the hibiscus became stunted, their leaves yellowed, and they looked terrible! When we did further research on the effects of phosphorus, we found out that in several species of plants, phosphorus ties up other minerals and nutrients, such as iron, before the roots can absorb them. So our hibiscus were being slowly starved to death. No matter how many nutrients we put in their fertilizer, their roots were absorbing less and less of everything the plants needed. This was enough to convince us that hibiscus need to be protected from high amounts of phosphorus. Bottom line - don't use high phosphorus fertilizers claiming to be bloom enhancers! They may do something for some species of plants, but for hibiscus they are a disaster waiting to happen.”


Quote:
Originally Posted by wit-nit View Post
Very interesting quote. My hibiscus of 20 years get 3x yearly feeding of phosphorus and the blooms are super large 8", very colorful and plentiful using a Super Bloom Booster 10-50-10. All flowering plants love phosphorus.
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Old 05-13-2018, 10:34 AM
 
Location: Out there somewhere...a traveling man.
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So you're saying all the 100's of hibiscus I've grown for the past 20-35 years that are doing so well are going to die?
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Old 05-13-2018, 12:10 PM
 
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Not sure think you need to check with gemstone1 for clarification.



Quote:
Originally Posted by wit-nit View Post
So you're saying all the 100's of hibiscus I've grown for the past 20-35 years that are doing so well are going to die?
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Old 05-13-2018, 12:33 PM
 
Location: Out there somewhere...a traveling man.
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Gemstone's article is not correct for all siuations and is probably intended for certain local conditions. In the Southwest especially the desert soils there is very little to none in phosphorus and other elements conducive to proper growing of flowering plants and other vegetation. Any plant non-native plant needs inspiration along with a boost in nutrients.

Other information on hibiscus and phosphorus:
If you find that you have over fertilized your hibiscus and it is blooming less, or not at all, add phosphorus to the soil to help bring the hibiscus blooms back....
https://www.gardeningknowhow.com/orn...ertilizing.htm

https://www.gardeningknowhow.com/gar...ant-growth.htm
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Old 05-15-2018, 05:57 PM
 
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Finding the following is working absolutely amazing:

triple superphosphate (0-45-0) granular + Epsom Salt
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Old 05-21-2018, 09:05 PM
 
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Perennials are in full bloom along with the roses.

What’s blooming in your garden?
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Old 06-12-2018, 06:43 PM
 
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Epsom Salt -inexpensive and it works, amazed at the results. Applying Epsom salt every 4 weeks.
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Old 06-22-2018, 05:09 AM
 
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Just tried Vigoro Bold Blooms fertilizer and impressed with the results.

https://www.homedepot.com/p/Vigoro-B...0232/203092420
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Old 07-01-2018, 04:58 AM
 
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Most flowering perrienials can benefit from some pruning back this time of the year as plants often get lengthy and reduce blooming this time of the year. Trim them back some and apply a light fertilizer to get a flourishing new fray of new blooms for the remainder of the summer.
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Old 06-20-2019, 06:19 PM
 
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Went with Granular Miracle-Gro Shake 'N Feed Rose And Bloom Continuous Release Plant Food this year and getting excellent results.

What are you using?
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