What is the Best Fertiliser for Frangipanis?

The heady sweet aroma of frangipani flowers conjures up images of tropical regions and warm, balmy summer evenings.

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There are evergreen species that are best suited to the more tropical and sub-tropical parts of northern Australia. While for southern regions, it’s better to choose a deciduous variety that will handle the winter better.

Frangipanis can be grown in the garden or in large pots and they’re fairly easy to care for. In fact, they’re ideal for coastal regions because they don’t mind sandy soils.

When it comes to fertilising your frangipani, it can be difficult to know exactly what approach is best including what products to use and when to apply them.

We’ve created this guide to help you best care for your frangipanis and keep them looking healthy and happy.

Do frangipanis require fertiliser?

All plants require nutrients in one form or another. Although frangipanis are not heavy feeders and fertiliser is not essential, they will benefit from some additional fertiliser in late spring or early summer. Especially, if you want them to impress you with plenty of gorgeous, scented blooms.

If you’ve only just planted your frangipani and have added lots of organic matter into the soil, then this will be enough to provide your plant with the nutrients it needs until the following spring.

However, if your frangipani has been growing in the same spot for a number of years, it’s definitely time to give it a good dose of organic fertiliser. This will encourage new growth and ensure that your plant blooms profusely.

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What type of fertiliser should you use for frangipanis?

Frangipanis prefer a balanced fertiliser with equal amount of nitrogen, potassium and phosphorous.

The nitrogen will stimulate lots of green growth while both the phosphorous and potassium will encourage plenty of flowers and keep the plant healthy.

When looking at fertiliser packets, this will be shown as a series of three numbers like 10:10:10 or 5:5:5.

This means that the fertiliser has an equal amount of all three macronutrients.

The formula used is N:P:K where:

  • N is for nitrogen, 
  • P is for phosphorous and 
  • K is for potassium.

Try to avoid fertilisers that have a high level of nitrogen compared to phosphorus and potassium levels if you want to encourage flowering.

For example, a fertiliser with an N:P:K ratio of 20:5:2 will give you plenty of lush growth but will not encourage flowering.

A liquid fertiliser is good, especially one that’s organic. This is usually mixed with water and allows you to water and feed your frangipani at the same time.

If you don’t want to mess with mixing up a liquid fertiliser, you can opt instead for a slow-release granular fertiliser.

Choose one that has balanced proportions of nitrogen, phosphorous and potassium. These fertilisers will usually be labelled as being suitable for flowering plants such as roses. 

To apply this type of fertiliser, scatter over the soil around the perimeter of the plant. Then, water it in well. This will ensure that the fertiliser is available to the roots as they need it.

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Also, keep in mind that fertiliser should be added as a supplement for whichever nutrients are lacking in your soil. There’s no NPK fertiliser that will always be right for each type of plant because we need to take into account the existing nutrients in the soil.

We recommend using a soil test kit to determine the Nitrogen, Phosphorous, Potash, and pH levels of your soil.

When should you fertilise your frangipanis?

The best time to fertilise your frangipanis is in late spring and early summer. Don’t fertilise your plants during winter because they will be dormant during this time.

However, your plants will start to spring back to life once the weather and the soil warms up. This is the perfect time to give them a nutritional boost by applying a balanced fertiliser. 

If using a liquid fertiliser like a seaweed concentrate or fish emulsion, you can apply one dose in late spring and then another one in early summer.

However, if you’re using a slow-release fertiliser, you only need to apply this once in late spring.

FAQs

Is Seasol good for frangipanis?

Seasol is an organic seaweed concentrate and can be used on frangipanis. Although it doesn’t contain large amounts of nitrogen, phosphorus, or potassium, it does help to stimulate plant growth and enables the roots of the plants to take up any nutrients that are in the soil. You can use it as a soil conditioner during summer in addition to the balanced fertiliser you applied in spring.

Is rose fertiliser good for frangipanis?

Rose fertiliser is perfect for feeding frangipanis. These types of fertilisers are designed primarily for flowering plants and will ensure that your frangipanis put on a magnificent display throughout summer.

How can you encourage your frangipani to flower?

Your frangipani needs nutrients, especially phosphorous and potassium to produce lots of lovely blooms. Therefore, if your frangipanis aren’t flowering, give them a dose of liquid fertiliser.

Photo of author

Annette Hird

Annette Hird has an Associate Diploma of Applied Science in Horticulture. She has worked in a variety of production nurseries, primarily as a propagator. She also had the responsibility of a large homestead garden that included lawn care, fruit trees, roses and many other ornamental plants. More recently, Annette has concentrated on improving the garden landscape of the homes that she has lived in and focused a lot of energy on growing edible plants as well. She now enjoys sharing her experience and knowledge with others by writing articles about all facets of gardening and growing plants.