Hibiscus forum: Fertilizer for tropicals

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Name: Alice
Saint Helena Island, SC (Zone 9a)
Charter ATP Member Aquaponics Hibiscus Orchids Fruit Growers Tropicals
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ardesia
Apr 7, 2018 4:32 PM CST
About 10 years ago I grew quite a few H. Rosa sinensis, I was even trialing them for a hybridizer. At that time the growers felt that, unlike other flowering plants, excess phosphorous was detrimental to good growth and flowering in tropical hibiscus. Yesterday I picked up a beautiful Tradewinds 'Mandarin Wind' and the tag with it said to fertilize with 5-10-5. Have the recommendations about phosphorous changed? What are you all feeding yours?
Thanks, alice
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Name: Jay
Nederland, Texas (Zone 9a)
Region: Texas Region: Gulf Coast Charter ATP Member I helped beta test the first seed swap I helped plan and beta test the plant database. I was one of the first 300 contributors to the plant database!
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Horntoad
Apr 16, 2018 7:46 PM CST
Yes, phosphorus should be low for H. rosa-sinensis. According to Hidden Valley Hibiscus, you should have medium Nitrogen, low phosphorus, and high potassium. The fertilizer they sell is 17-5-24, so anything with a similar ration would be best. Personally, I have had pretty good success with Miracle Grow.
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Name: Alice
Saint Helena Island, SC (Zone 9a)
Charter ATP Member Aquaponics Hibiscus Orchids Fruit Growers Tropicals
Hummingbirder Garden Photography Container Gardener Butterflies Bromeliad Birds
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ardesia
Apr 17, 2018 3:49 AM CST
Thanks Horntoad, that is what I remembered. We have an excess of phosphorus in our soils and water here, I didn't want to add to the problem.
Minds are like parachutes; they work better when they are open.
Name: Eric
Hawthorne, fl (Zone 9a)
Miamiu
Jul 11, 2018 8:32 AM CST
I am testing out miracle gro potting mix on two small tropical hibiscus I purchased online. Most websites i read say it can be used on them. I'll update in a few weeks to see how well it works.
Name: Eric
Hawthorne, fl (Zone 9a)
Miamiu
Jul 13, 2018 11:36 AM CST
Been 2 days so far a few leaves are yellowing on one and lost a bud not sure if it is because of potting mix, or it became too hot because they have to be slowly introduced to sunlight. Also maybe still stressed from the mail.
[Last edited by Miamiu - Jul 13, 2018 11:37 AM (+)]
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Name: Karen
NM (Zone 7b)
Region: New Mexico Critters Allowed Region: Arizona Xeriscape Greenhouse Annuals
Cactus and Succulents Bromeliad Adeniums Orchids Tropicals Plumerias
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plantmanager
Jul 13, 2018 11:40 AM CST
It could just be the transplant shock right now. I've frequently had buds drop after re-potting. I'm not too fond of miracle gro potting mix. It seems over priced, and to me it under performs. Make sure you don't have the one with the water holding crystals added.
Can you show us photos of the plants you are worrying about?
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Name: Eric
Hawthorne, fl (Zone 9a)
Miamiu
Jul 13, 2018 12:43 PM CST
Not quite worried yet few yellow leaves coming o n though. Only had them out of the mail 3 days. Did not realize first pic is blurry.
Thumb of 2018-07-13/Miamiu/34ebdc
The other one is looking normal.

Thumb of 2018-07-13/Miamiu/e299bb

[Last edited by Miamiu - Jul 13, 2018 12:46 PM (+)]
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Name: Karen
NM (Zone 7b)
Region: New Mexico Critters Allowed Region: Arizona Xeriscape Greenhouse Annuals
Cactus and Succulents Bromeliad Adeniums Orchids Tropicals Plumerias
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plantmanager
Jul 13, 2018 12:53 PM CST
Eric, for some reason I can't see either of the photos. Can you try again?
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Name: Eric
Hawthorne, fl (Zone 9a)
Miamiu
Jul 13, 2018 2:16 PM CST
Are they blurry, or you just can not see them? I am using a fire tablet.
Thumb of 2018-07-13/Miamiu/ceae1a




Thumb of 2018-07-13/Miamiu/dced79

[Last edited by Miamiu - Jul 13, 2018 2:19 PM (+)]
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Name: Karen
NM (Zone 7b)
Region: New Mexico Critters Allowed Region: Arizona Xeriscape Greenhouse Annuals
Cactus and Succulents Bromeliad Adeniums Orchids Tropicals Plumerias
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plantmanager
Jul 13, 2018 2:19 PM CST
Ok, they weren't there at all, but they are now. The first pic is quite blurry but the second one is better. Since you haven't had them long, I'm thinking they look fine. Make sure they have good light and enough water and they should do fine.
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Name: Eric
Hawthorne, fl (Zone 9a)
Miamiu
Jul 13, 2018 2:21 PM CST
It's always an adjustment process with the new because you have to slowly get them used to sunlight. Also I don't want to over water them.
Name: Cheryl
Texas (Zone 9a)
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ShadyGreenThumb
Jul 13, 2018 2:22 PM CST
I am not a fan of Miracle Grow products. They are partnered with Scotts who is partnered with Monsanto.

Also ever try to find things like NPK numbers or ingredients on Miracle Gro products? You can't. It's a secret.

I buy 40-60 bags of Miracle Gro Garden Soil every year when it goes on sale. By fall it's gone, used in my gardens here and there. When this batch is gone, it will be gone from my yard forever.
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Name: Eric
Hawthorne, fl (Zone 9a)
Miamiu
Jul 21, 2018 12:30 PM CST
So it's been a week. Plants really have not grown much. I had four buds on one when it shipped and they all went bad. Maybe due to miracle gro used for soil.
[Last edited by Miamiu - Jul 21, 2018 12:31 PM (+)]
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Name: Karen
NM (Zone 7b)
Region: New Mexico Critters Allowed Region: Arizona Xeriscape Greenhouse Annuals
Cactus and Succulents Bromeliad Adeniums Orchids Tropicals Plumerias
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plantmanager
Jul 21, 2018 12:36 PM CST
It could still be transplant shock. I have my new hardy hibiscus in the ground. It's got some yellow and dropping leaves. The others turned purple. The one bud is still hanging on, but seems shrunken, so I expect it to drop soon.
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Name: Jay
Nederland, Texas (Zone 9a)
Region: Texas Region: Gulf Coast Charter ATP Member I helped beta test the first seed swap I helped plan and beta test the plant database. I was one of the first 300 contributors to the plant database!
Celebrating Gardening: 2015 Plant Identifier Tip Photographer Garden Sages Garden Ideas: Master Level Hibiscus
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Horntoad
Jul 21, 2018 1:24 PM CST
I agree with Karen, it's more likely due to transplant shock. I've had plenty lose buds after transplanting. Never had an issue with Miracle Gro.
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Name: Eric
Hawthorne, fl (Zone 9a)
Miamiu
Jul 21, 2018 1:58 PM CST
plantmanager said:It could still be transplant shock. I have my new hardy hibiscus in the ground. It's got some yellow and dropping leaves. The others turned purple. The one bud is still hanging on, but seems shrunken, so I expect it to drop soon.


I am not sure you have to do this with the hardy, but when you buy his tropical he says to slowly introduce them to sunlight.
Name: Karen
NM (Zone 7b)
Region: New Mexico Critters Allowed Region: Arizona Xeriscape Greenhouse Annuals
Cactus and Succulents Bromeliad Adeniums Orchids Tropicals Plumerias
Image
plantmanager
Jul 21, 2018 2:01 PM CST
I would do that with a tropical one, but didn't do it with the hardy one I got. I put it directly into the sunny spot and only shaded it with a chair the first day. I imagine that's why the leaves turned purple so quickly.
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Name: Eric
Hawthorne, fl (Zone 9a)
Miamiu
Jul 31, 2018 5:44 PM CST
So both plants have buds now. I am also using hibisgain on my other ones. So far have not seen much flowering after two sessions of fertilizer the past two months with hibisgain. I'm fertilizing every 3 weeks.
[Last edited by Miamiu - Jul 31, 2018 5:45 PM (+)]
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Name: Jay
Nederland, Texas (Zone 9a)
Region: Texas Region: Gulf Coast Charter ATP Member I helped beta test the first seed swap I helped plan and beta test the plant database. I was one of the first 300 contributors to the plant database!
Celebrating Gardening: 2015 Plant Identifier Tip Photographer Garden Sages Garden Ideas: Master Level Hibiscus
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Horntoad
Jul 31, 2018 6:18 PM CST
Miamiu said:So both plants have buds now. I am also using hibisgain on my other ones. So far have not seen much flowering after two sessions of fertilizer the past two months with hibisgain. I'm fertilizing every 3 weeks.




Palmgain by the same manufacturer has an NPK ration closer to what tropicals like. Also contains Magnesium, Iron, which is important to topicals.
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Name: Eric
Hawthorne, fl (Zone 9a)
Miamiu
Aug 1, 2018 8:01 AM CST
Would it be better to fertilize every two weeks rather than every three?

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