Best Fertilizer for Hibiscus: Homemade, Organic, Liquid, NPK, and Compost Manure

Hibiscus plants have beautiful flowers that are extremely popular in the tropics. If you keep your Hibiscus plant healthy and constantly flowering, it is important to know how to properly fertilize this plant. These are the three main elements that a Hibiscus plant craves as they all offer positive nutrients which will benefit the plant. Let’s check out the best fertilizer for Hibiscus.

Best Fertilizer for Hibiscus
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Nitrogen – Hibiscus suffers from too much or too little nitrogen. Plants at low levels lack substantial nutritional support. At the highest level, nitrogen triggers leave at the expense of flowers. Too much nitrogen causes buds to fall and can burn roots and leaves. Hibiscus requires moderate nitrogen levels in proportion to the other two numbers.

Phosphorus – Many bloom-enhancing fertilizers have more phosphorus. This is not a good sign for Hibiscus. Phosphorus does not move easily, it builds over time. Too much soil phosphorus binds other essential nutrients that need to thrive. Nutrients cannot be absorbed even when they are present. Instead of growing Hibiscus flowers, high phosphorus stops them. Keep the middle number low on your Hibiscus fertilizer.

Potassium –Potassium is the most important nutrient for the blooms and overall health of Hibiscus. It balances, organizes, and supports all aspects of plant growth. Hibiscus flowers, with their vibrant colors and sizes, demand more potassium than other blooming plants. High potassium helps leaves and flowers stay hydrated, and the need for these magnificent flowers provides nutritional support. The last number on your fertilizer label should be the highest. 

Best fertilizer for Hibiscus

Homemade fertilizers for Hibiscus 

Vinegar

Dilute a cup of vinegar in a gallon of water and pour all the solution into the roots of the plant. The solution, which settles around the roots, opens up important nutrients in the soil, feeding Hibiscus plants. Be careful not to find a solution on leaves or flowers, which will die.

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Red Hibiscus
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Coffee grounds

Coffee grounds provide a good supply of nutrients to your Hibiscus.

Banana peels

Bananas and their peels have high levels of potassium and moderate levels of nitrogen. These are macronutrients that are essential for the health of Hibiscus. They can be added to compost bins or piles, and this material can be used as a mulch or soil supplement when fully composted. Alternatively, the whole or chopped banana peel can be used as the source of organic nutrients when directly patterned on the soil under a Hibiscus sample dripline, or mixed with it. The dripline is the soil level area below the outermost branches of the plant. 

Wood ash

Wood ash is also rich in potassium. It can be sprinkled into your compost. 

Blackstrap molasses

Sugar beets are rich in nutrients such as calcium, magnesium, iron, and potassium. To use blackstrap molasses, mix the molasses in water. Spray on the soil around the base of the Hibiscus plant.

Natural fertilizers for Hibiscus 

Although organic mulch is known to help preserve moisture and prevent weeds from growing, it also adds nutrients to the soil. The appropriate choices that fertilize the soil as they decompose include oak leaves, pine needles, bark chips, or shredded bark. 

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Yellow Hibiscus
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Tea leaves

Used tea grounds and fresh tea leaves contain nutrients and tannic acids that create a more fertile environment for gardens, landscapes, and container plants when added to the soil. Since tea grounds are natural, organic matter increases nutritional levels and improves soil quality as soon as they are dissolved.

Liquid fertilizers for Hibiscus 

  • Dry four banana peels and 3 eggshells. Add 4 tablespoons of Epsom salt by mixing them. Grind this mixture in powder in a food blender. Pour 75 ml of water on the powder, shake to mix, and water your plants with this liquid.
  • Since Hibiscus plants require an abundance of micronutrients to thrive, it is wise to spray organic foliar spray to address the lack of extreme nutrients in the soil. Most water-soluble organic fertilizers can become foliar sprays, including powdered capsules or fish emulation. If your soil lacks micronutrients, you can apply them safely three times each year.
  • If you have a fish tank in your house, the dirty fish water can be used to water your plants. Nothing needs to be prepared for this fertilizer as your fish has already worked. Use this dirty water to water all household plants, including your Hibiscus, every other week for great results.
  • Liquid seaweed fertilizer should be applied for Hibiscus every one to two weeks for best results.
  • Fill a large bucket with organic compost or manure and closed with a lid. Finish filling the bucket above water. Hole in the lid to allow the air to escape, and place the lid on the bucket. Allow compost and water mixture to stand in a cool, dry place like a storage shed for at least a week. Organic material from compost or manure will slowly leech in water to make compost tea. Dilute compost tea with water, including Hibiscus, for use on plants. Mix 1 portion compost tea in 5 to 10 portions of water. Use less diluted tea for monthly fertilization and more diluted tea for daily applications. Full-strength tea can burn plant roots or disrupt soil-dwelling germs. Put diluted fertilizer directly on plant roots or in a spray bottle for distribution in plants.
  • Put 1 gallon of water in a large bucket or container. Add 1 cup of diluted compost tea. Liquid seaweed, apple cider, vinegar, and black-strap or dark molasses. Compost tea contains nitrogen and other nutrients, liquid seaweed provides plant hormones, vinegar increases soil acidity, and molasses feed beneficial microorganisms in the soil. When the Hibiscus plants are transplanted for the first time, liquid fertilizer on the roots, and pour on the seeds when starting new plants. Spray liquid fertilizer regularly on leaves and trunks to feed maintenance.

Compost manure for Hibiscus  

Manure

Animal manures such as cows, sheep, horses, or poultry provide the best organic material for the Hibiscus.

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Hibiscus Yellow
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Worm castings

Worm castings are a great addition to the soil as they are much richer than regular fertilizer. This is because worm castings are digested products of specific earthworms. Worm castings heave potassium, phosphorus, nitrogen, humus, and other micronutrients that are extremely beneficial for Hibiscus.

Organic fertilizers for Hibiscus 

Blood and bone meal

Blood and bone will not damage your Hibiscus. Blood and bone not only support good growth but so importantly improve the soil.

Commercial fertilizers for Hibiscus 

Hibiscus plants need a fertilizer that contains a medium amount of nitrogen, low in phosphorus or phosphate, and has an overdose of potash (K). Water the plants well before and after using dry fertilizer to avoid burning the roots in dry soil. Liquid fertilizer which has been reduced to full force can be used every time plants are watered.

NPK ratio 

The best Hibiscus fertilizer can be either slow-release or water-soluble. With either, you’d like to fertilize your Hibiscus with balanced compost. It will be a fertilizer with all the same numbers. Hence, for example, balanced fertilizer 20-20-20 or 10-10-10. If you are using water-soluble fertilizer, use it at half the power to avoid over-fertilizing the Hibiscus tree.

Over-fertilizing Hibiscus plants result in burning roots or providing a lot of fertilizer, which will cause no less or no flowers or yellow, leaves will fall. The need for micronutrients varies depending on the plant, its soil, and weather. In general, fertilizers of all purposes should contain trace amounts of boron, chloride, copper, iron, magnesium, manganese, molybdenum, sulfur, and zinc.

Without these trace elements, Hibiscus can develop deficiencies such as iron chlorosis, a condition that causes the death of the plant in yellow leaves and serious cases. Hibiscus prefers frequent, light food. They need less during the winter months. In the full sun, they need more. For example, apply water-soluble 17-5-24 fertilizer 1/2 teaspoon per 1 gallon of water. 

Hibiscus fertilizer schedule 

Hibiscus plants appreciate the light but regular application of fertilizer. This will result in a healthy plant that often blooms. For slow-release fertilizer, fertilizing in the following 4 steps:

  • Early spring
  • When the plant ends the first cycle of blooming
  • Halfway through summer
  • At the beginning of winter

For water-soluble fertilizer, you should fertilize it every 2 weeks in spring and summer. However, reduce application once every 4 weeks in autumn and winter. When fertilizing your Hibiscus tree, make sure you spread fertilizer to all the soil under the tree canopy. This is important because some gardeners only fertilize near the base, but it does not feed the entire root system. 

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Pink Hibiscus Flower
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How to fertilize Hibiscus in pots

Best potting mix for growing Hibiscus 50% garden soil and river sand, 20% vermicompost, 20% cow manure, and remaining 10% neem powder and muster cake mixture. Hibiscus loves acidic soil add lemon water or vinegar to maintain soil acidity. If you’re growing your Hibiscus in a container, you’ll likely need to fertilize more often if you were growing it in the ground. Being a heavy drinker, the Hibiscus grown in a pot will also need extra water, so give it a diluted liquid seaweed whenever you water your container plants. 

Fertilize Hibiscus every two weeks. Use water-soluble fertilizer combination with the type of slow-release. You can use more NPK fertilizers in the last number to encourage more blooms. Otherwise, bone meal, ran meal, dry banana peel, and onion peel fertilizer to encourage more blooms. Be sure to feed your Hibiscus with this fertilizer every other week. This is the only way to give your plant all those nutrients and make it produce healthy flowers.

Frequently asked questions about fertilizers for Hibiscus (FAQ)

Why are the Hibiscus leaves turning yellow?

Nutrient-deficient Hibiscus plants can produce iron chlorosis, causing leaves to turn yellow with green veins. Tropical Hibiscus plants usually need a lot of water, but too much or too little water can cause yellow leaves. 

Why are my Hibiscus plants not flowering?

The reason why Hibiscus does not flower is usually caused by too much shade, drought pressure, or too much fertilizer. Nitrogen promotes leaves at the expense of flowers and too much phosphorus reduces the Hibiscus blooms by immobilizing nutrients in the soil.\

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Red Hibiscus Flower
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Is potassium nitrate good for Hibiscus?

You’ll see the almost immediate effects of adding potassium nitrate to your Hibiscus for more flowers, bright colors, strong wood, and roots.

Is Seasol good for Hibiscus?

Hibiscus will need to be fed with liquid manure (Seasol is a good proposition) every month as directed by the mixture you choose.

Can I use citrus fertilizer on Hibiscus?

Citrus food can also be used to feed long flowering plants such as Gardenia, Roses, Hibiscus. 

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