7 Best Hibiscus Fertilizers + How and When To Use Them

Say the word “hibiscus” and you’re transported to a lush, tropical oasis, surrounded by vibrant, flowering plants that luxuriate in all that humidity and warmth. Luckily, even those of us who live in less-than-tropical regions can have that sultry experience once we have an understanding of how to nourish these tropical beauties effectively.

One way of ensuring success is seeking out the best hibiscus fertilizers for these particular plants. In their native environment, they rely on nutrient-rich natural resources around them to supplement their preferred sand or clay-based soil. So, it’s no wonder they need a hefty boost of fertilizing to encourage their spectacular blooms when residing in our gardens.

What Is The Best Fertilizer For Hibiscus?

Hibiscus plants have an enviable ability to maintain that abundant display of vibrant, colorful blooms much further into the season than many other flowering plants that are often past their best by the end of summer. But to achieve the same results in your garden you’ll need to boost their intake of nitrogen and potassium.

They will also respond well to a soil that is enriched with a wide range of micronutrients and thankfully these can be found in many of the best hibiscus fertilizers. Furthermore, regular mulching in addition to fertilizing will nourish the soil and help your hibiscus plants to flourish.  

Thankfully, my pick of the best hibiscus fertilizers means there are choices to suit all gardening circumstances and user preferences. Whether that’s a slow-release option in the form of small spikes or granules, or a water-soluble type that works immediately, I’ve got you covered.

Another thing to consider when selecting the right hibiscus fertilizer for your plants is that, unlike many other species, hibiscus can absorb some nutrients through their leaves. This means they will also do well if they are fed with a foliar spray.

This is great news if you are planning on using a liquid or ‘tea’ fertilizer. And choosing a foliar spray with neem will also help to protect your hibiscus against pest infestations. If you do opt for a foliar spray, I would encourage you to always use an organic option as these are often less harsh and will eliminate the risk of leaf burn.  

Hibiscus Plant Food N-P-K Ratio  

The best way to make sure your hibiscus continues to achieve spectacular displays year after year is to ensure phosphorous levels are kept low and nitrogen and potassium are optimized.

These all-important macro-nutrients are required to keep plants looking healthy and happy. Here’s a short guide to what these macro-nutrients are and how they can support the growth of your hibiscus plants.

Nitrogen

Nitrogen is used by plants for the production of chlorophyll and other important metabolic processes. Our need for this element is something we all have in common with our plants. We get ours from the things we eat and drink. Similarly, hibiscus plants get their “food and drink” from what is naturally in the soil and from us, the gardeners who care for them.

When considering the best hibiscus fertilizer, you will come across many with a high concentration of nitrogen to ensure the enduring and long-lasting vitality of hibiscus plants. However, as is the case with most things, too much of a good thing can be bad and can cause nitrogen burn.

I encourage you to avoid using nitrogen in excess if your soil is rich in nitrogen or your plants are young. Take it from me, always consider factors such as: planting location, soil condition, plant age, and size to help you strike the right balance of how much nitrogen to incorporate into your hibiscus feed.

Phosphorus

As mentioned before, compared to other blooming plants, hibiscus plants don’t perform well with high levels of phosphorus in their feed. A healthy hibiscus doesn’t require very much of it. Indeed, over-feeding this element will cause a build-up in the plant’s system and may block other, more needed nutrients from being absorbed by the roots. Resulting in the plant failing.

I only really incorporate higher doses of phosphorus for any ailing plants that have slowed down or stop flowering completely. A tiny boost of phosphorus can jump-start the plant’s flower-producing processes. Too much, and the plant will continue to decline.

Before planting a new hibiscus, you may want to do a soil test to see how much phosphorus is naturally present in the soil. If it’s too high, you’ll need to amend the soil or choose another planting location.

Potassium

Where other garden bloomers are nitrogen lovers, hibiscus shrubs and trees are big fans of potassium as it benefits them in so many ways. It stimulates robust plant and root system growth. Promotes strong photosynthesis processes. Helps to strengthen the growth and formation of stems and leaves and acts as a tonic to generate pest and disease resistance.

When nourished with a higher potassium feed, you will be rewarded with lush, green leaves and vibrantly colored flowers that are perfectly structured. The bees and butterflies appreciate it too. They not only enjoy the flowers but might stick around to pollinate the rest of our gardens!

For all these reasons, hibiscus’ don’t hesitate to let us know when it’s not getting enough potassium. Be on the lookout for browning tips and edges on older leaves. This could indicate a potassium deficiency.

Put simply, it’s the nitrogen and potassium that helps to encourage and maintain that beautiful, lush growth and bloom production throughout their growing season.


Best Fertilizer For Hibiscus Reviews

Now it’s over to you to match up your requirements with my pick of the best hibiscus fertilizers that are available on the market today.

It’s fair to say that no single fertilizing formula is perfect for every situation. Not to mention our own personal preferences when it comes to gardening. One gardener’s need for an all-purpose product may conflict with another’s desire to fix up an ailing tree or shrub.

With this in mind my selection is based on a broad range of excellent products for you to use when fertilizing your hibiscus at home.

I’ve looked at the quality of the fertilizer ingredients, its overall performance as well as the level of customer satisfaction taken from thousands of customer reviews across all major retail platforms, and of course the product’s ease of use.


1. Miracle-Gro All Purpose Plant Food 24-8-16

miracle-gro-all-purpose-plant-food

My first pick for a great quick-release option is from Miracle-Gro. It’s water-soluble and offers a good nutrient balance for hibiscus, however, I use half the recommended dosage. Simply water into my hibiscus border or pots and have had great success with large blooms, often seeing positive results faster than expected.

I’d also recommend this for encouraging blooms on potted hibiscus that you want to over-winter indoors. Everything needs to be just right to get winter blooms but it is achievable and Miracle-Gro is one part of that particular puzzle that you can control. It’s lovely to see such vivid color when everything else outside has gone dormant!

Check Miracle-Gro latest price on Amazon.com

How To Use: For a fast-acting dose of nutrients, simply shake the bottle well before each application and mix the recommended amount with water. Feed your hibiscus every 1-2 weeks, depending on the season and weather conditions, for lush, indoor, or outdoor tropicals.

Customer Reviews: Gardeners who have tried cheaper products in the past are saying they went right back to Miracle-Gro All Purpose Plant Food. And those who have been unlucky with hibiscus previously are raving about their spectacular results. All awarding this product 4.7 / 5 stars.

Pros      

  • Provides quick-release formula for fast results
  • Easy application every 1-2 weeks

Cons

  • Relatively high price point for this quality product

2. EarthPods Hibiscus Plant Food 0.2-0.2-0.4

EarthPods Premium Hibiscus & Tropical Flower Plant Food – Easy Organic Fertilizer Spikes

These small, eco-conscious capsules from EarthPods vigorously promote root growth and color vibrancy for potted hibiscus and other tropicals like bougainvillea, plumeria, bird of paradise, passionflower, and jasmine.

These concentrated pods come with a canister count of 100, so no messy measuring is required with this one. And with no odor, the canister can be easily stored on your kitchen shelf and then recycled when empty.

Buy Earth Pods Hibiscus Food online here.

How to use: Insert EarthPods Hibiscus capsules (as recommended on the label) into the potting soil once every 1-2 weeks near the base of your potted plant to introduce a wide variety of organic nutrients and trace minerals.

Customer reviews: Gardeners are so happy with the simple application process that produces such an environmentally friendly result, declaring this the only fertilizer they’ll buy. Awarding it a generous 4.6 out of 5

Pros      

  • Beneficial for a wide range of tropical plants
  • Capsules are easily stored and recyclable
  • Odorless

Cons

  • Can be a costly way to fertilize if you have lots of plants or large plant

3. Down to Earth Organic Neem Seed Meal Fertilizer 6-1-2

Down to earth neem seed fertilizer

This 6-1-2 NPK option made from the cold-pressed seeds of the Neem tree is versatile enough to be used in several different ways to accommodate your needs and that of your plants. It can be mixed into ground soil or potting mix as a slow-release method. Or applied as a steeped tea for quicker results.

When used as a tea it can be applied to foliage where leaves not only absorb nutrients but are also provided with protection against pests.

Formulated without the use of synthetics or stimulants, this Down to Earth product has been certified by the Organic Materials Review Institute which means you can be assured that it contains nothing but goodness.

Buy Neem Seed Meal here on Amazon.com

How To Use: As a tea, mix no more than 2 cups into 5 gallons (4 liters) of water and let it steep for 3 days. It can then be used as a foliar spray. For a slow-release option, work the recommended amount, based on in-ground shrub or pot size, into the soil.

Customer Reviews: Consumers are delighted with the dramatic results they’ve seen with this product. Including the unexpected benefit of it eliminating all damaging pests while leaving beneficial insects alone. Awarding this eco-friendly option an impressive 4.7 / 5 stars.

Pros      

  • Can be used in a variety of different application methods
  • Eliminates harmful pests while protecting beneficial insects

Cons

  • It has that all-natural organic smell. But hey, it’s an all-natural organic product!

4. Osmocote Smart-Release Plant Food 15-9-12

Osmocote-Smart-Release-Plant-Food

This next pick is specifically formulated for potted plants and contains no less than eleven essential minerals. It’s a granular, slow-release option from Osmocote and continues to nourish soil and roots for up to 6 months.

It works by allowing nutrients to be gradually released into the soil as the surrounding temperature warms up to coincide with the plant’s active growing season. And when used as directed, there is no risk of root burn.

Check out Osmocote prices here.

How to use: As a soluble, sprinkle 1 scoopful of feed per 2 gallons (8 liters) of water for every 4 square feet of plant. For a slow-release application, mix the recommended amount into the top 1-3 inches of potting soil. Then water regularly.

Customer reviews: Users were amazed at how otherwise dull and lackluster plants were revived and became vibrant in color again. Plants that were not expected to survive, due to severe weather, held up as a result of strong roots, stems, and foliage. And the large-sized bag means very good value for money. Granting this product from Osmocote 4.7 / 5 stars.

Pros      

  • Feeds for up to 6 months
  • No risk of root burn

Cons

  • Tiny resin pellets may be visible once nutrients have been delivered

5. Espoma Flower-Tone Plant Food Organic Fertilizer 4-3-4

Espoma Flower-Tone Plant Food, Natural & Organic Fertilizer

This granular, Flower-Tone option from Espoma is perfect if your garden bed or container soil is already rich in nitrogen. Nutrients are slowly released to your plants over time without overwhelming them with what they don’t need.

Their patented Bio-tone microbes formula plus a 4-3-4 NPK promotes abundant blooms on most flowering plants including hibiscus. And it’s versatile enough for outdoor garden beds and containers as well as indoor potting, with no unnecessary fillers.

You can buy Flower-Tone on Amazon.com.

How to use: Just evenly pepper the granules onto the soil around your hibiscus. Then, water thoroughly. Be sure to follow the recommended amounts on the label based on the plant’s size and location.

I find this hibiscus fertilizer can cause leaf burn if any product is left to settle on either the foliage or stems. If you do notice any wayward spillage, simply brush it off to protect your plants.

Customer reviews: Gardeners are reporting such great success with this product, they’re excited to spread the word! Hibiscus and other flowering plants in their gardens are just covered in stunning blooms. Publicly awarding this plant food 4.7 / 5 stars.

Pros      

  • Promotes an abundance of blooms on hibiscus shrubs and trees
  • Great results on most flowering plants

Cons

  • May take longer to display great results due to slow-release nature

6. Down to Earth Organic Langbeinite Fertilizer Mix 0-0-22

Down to Earth Organic Langbeinite Fertilizer Mix

For hibiscus plants that already benefit from nitrogen-rich soil and don’t require any extra, this fertilizer is high in potassium and a water-soluble option from Down to Earth. As a foliar spray or direct watering application, its 0-0-22 NPK is specially formulated to ensure that your hibiscus (and other plants with similar needs) stay healthy with robust roots and vigorous growth throughout the warmer seasons without overfeeding.

How to use: As a foliar spray, combine 1/2 to 1 teaspoon of langbeinite to 1 gallon (4 liters) of water. Then, apply with even coverage directly onto the plant’s leaves. For direct watering applications, combine 1-2 tablespoons to 1 gallon (4 liters) of water. Check Langbeinite out prices here

Customer reviews: Consumers were impressed with the increase in their plant’s vitality and the overall health of their gardens, especially in desert and valley regions. Earning Down to Earth’s Langbeinite feed a whopping 4.8 / 5 stars.

Pros      

  • Can be used as a ‘tea’ or foliar spray
  • Low risk of sulfur burn

Cons

  • May take longer to display great results due to slow-release nature

7. Dr. Earth Organic Bud & Bloom Hibiscus Fertilizer 3-9-4

Dr-Earth-Flower-Girl

Sometimes, a good soil test may reveal that your plant’s soil has been depleted of all its phosphorus. As we’ve discussed, hibiscus plants do need a bit of it to allow for proper absorption of other nutrients. That’s when Dr. Earth comes to the rescue.

This granular feed has the right balance of nutrients to get your soil on track so that plants can start to produce more bountiful blooms once again. You can buy Dr Earth Organic Bud and Bloom at Amazon.com

How to use: For new plantings, work 1/2 – 2 cups of granules into your soil. For established plants, apply the recommended amount on the label based on the number of cubic feet of soil around your plant.

Customer reviews: Gardeners are very pleased with this product’s ability to properly amend their soil with just the right amount of phosphorus to support healthy plants. The amazing results they get make the slightly higher price point well worth the investment. Granting Dr. Earth’s Bloom Booster 4.7 / 5 stars.

Pros      

  • Can help soil that is lacking in phosphorus
  • Slow-release so less risk of leaf and root burn

Cons

  • Marginally more expensive than the competition but worth the investment

How To Fertilize Hibiscus

As we’ve seen in my top hibiscus fertilizers list, the easiest and most rewarding way to bring about health and bountiful blooms throughout the summer months for your hibiscus plants is with either a fast-acting, water-soluble feed or a slow-release, granular one. And the variety of NPK ratios presented gives you the flexibility to meet both your plant’s needs and those of the rest of your garden at any level.

If you’re looking to fertilize a hibiscus alone, then you’ll want to choose an N-P-K that’s high in nitrogen and potassium but low in phosphorus (X-x-X). If your soil is already rich in nitrogen then success may be found in the feed that’s heavy in potassium and low in the others (x-x-X).

If a soil test reveals that a little more phosphorus is needed to amend the soil and aid in nutrient absorption, a fertilizer with a more balanced NPK ratio may be the best solution. Bottom line? Understanding your soil means understanding your hibiscus and the best way to understand your soil is with a pH soil test kit.

Soil pH

Knowing how much nitrogen, phosphorus, and potassium is present in your soil is half of the overall picture. The second half is knowing what the pH level is. Hibiscus plants are happiest in slightly acidic or alkaline soil. And in the case of vibrant hibiscus blooms, slightly means a pH level of between 6.5 and 6.8.

If a soil test reveals this to be too high, the pH level can actually be lowered by mixing in a sulfur compound like aluminum sulfate. If it’s too high, a lime compound like dolomite or agricultural limestone will raise it up.

When To Fertilize Hibiscus

Hibiscus typically begin to form buds when the temperature rises to consistently warmer levels in spring. When that specifically occurs will vary according to climate and when spring arrives in your particular regions. This actually makes it easy to determine when to start feeding your plants. Regardless of the type of feed you choose (quick or slow-release), when the first round of blooms have faded, that’s when they’re ready.

Continue feeding through the summer to promote healthy foliage growth then finish the process in autumn. Hibiscus won’t require feeding during their winter, dormancy period.

How Often To Fertilize Hibiscus    

How often depends on where your hibiscus plants and shrubs grow. Because potted plants experience nutrient depletion as excess water drains, they will need to be fed and watered more frequently. If you’re using a water-soluble fertilizer, roughly once a week during their active, blooming period. Plants growing in garden beds can easily go two weeks in between feedings as ground soil retains water and nutrients better.

If you’re using a slow-release option, applying it just three times per year is all it takes. Once in late spring, after the first round of blooms. Again in mid-summer, to boost foliage growth and then a final time in autumn to last them through winter.

Final Thoughts On Hibiscus Fertilizer

Well, there you have it! A complete list of the best hibiscus fertilizers out there based on reviews from gardeners just like you. Plus great ideas and tips from our team collected over decades of experience.

The nutrition needs of hibiscus plants for strong plants and vibrant blooms are unique but aren’t terribly complicated when you understand what they are and what the soil is already providing. The only thing left is to make up the difference with the right fertilizer.

So my final recommendations are to shoot for Miracle-Gro’s All Purpose Plant Food for general garden use. It’s a water-soluble option, allowing you to drench the nutrients directly into the soil so they can get to work immediately. Alternatively, if your growing potted plants then I would use EarthPods Hibiscus Plant Food. This is a high-quality, easy-to-use product that won’t let you down.

FAQ Best Fertilizer For Hibiscus

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