U.S. CitiesCity-Data Forum Index
Go Back   City-Data Forum > General Forums > Garden
 [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
View detailed profile (Advanced) or search
site with Google Custom Search

Search Forums  (Advanced)
Reply Start New Thread
 
Old 05-13-2018, 05:39 AM
 
Location: Zone 6B ~ Northern VA
1,318 posts, read 1,906,810 times
Reputation: 352

Advertisements

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.
Reply With Quote Quick reply to this message

 
Old 05-13-2018, 10:34 AM
 
Location: Out there somewhere...
37,879 posts, read 43,020,732 times
Reputation: 103350
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?
Reply With Quote Quick reply to this message
 
Old 05-13-2018, 12:10 PM
 
Location: Zone 6B ~ Northern VA
1,318 posts, read 1,906,810 times
Reputation: 352
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?
Reply With Quote Quick reply to this message
 
Old 05-13-2018, 12:33 PM
 
Location: Out there somewhere...
37,879 posts, read 43,020,732 times
Reputation: 103350
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
Reply With Quote Quick reply to this message
 
Old Today, 05:57 PM
 
Location: Zone 6B ~ Northern VA
1,318 posts, read 1,906,810 times
Reputation: 352
Finding the following is working absolutely amazing:

triple superphosphate (0-45-0) granular + Epsom Salt
Reply With Quote Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


Reply

Quick Reply
Message:


Over $104,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > Garden
Follow City-Data.com founder on our Forum or

All times are GMT -6.

© 2005-2017, Advameg, Inc.

City-Data.com - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32 - Top