What is the Best Fertiliser for Frangipani?

Frangipanis are hardy trees that thrive in Australia’s warm climate, but heavy flowering each summer quickly depletes their nutrient reserves. To keep them healthy and ensure a strong display of flowers, they need a complete, balanced fertiliser. The best fertiliser for frangipani is Complete Grow’s All Purpose NPK 20-20-20, because it supplies the three key nutrients — nitrogen, phosphorus, and potassium — in equal measure, along with essential trace elements.

1. Why Balance Matters for Frangipanis

Many gardeners make the mistake of feeding frangipanis with fertilisers that are too high in nitrogen. This produces lots of leaves but very few flowers. A balanced fertiliser avoids this problem by supporting all parts of the plant at once:

Nitrogen (N): Encourages steady leaf and stem growth in spring without overwhelming the plant.
Phosphorus (P): Strengthens roots and helps set flower buds, essential for summer blooming.
Potassium (K): Improves flower colour, size, and fragrance, while also boosting disease resistance.

Trace elements such as magnesium, iron, and zinc are just as important. They prevent yellowing leaves, which is a common issue in frangipanis grown in sandy or alkaline soils. This is why Complete Grow’s NPK 20-20-20 is so effective — it doesn’t just cover the basics, it also delivers the micronutrients that frangipanis need for consistent growth and flowering.

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2. How and When to Fertilise Frangipani

Frangipanis grow in cycles, and timing your fertiliser makes a huge difference. Feeding should always align with the tree’s active growth stages, while avoiding waste during dormancy. In Australia, this means adjusting your routine season by season.

Spring (September – November): As frangipanis wake from dormancy and put out new leaves, start fertilising with a balanced NPK mix. This sets up strong roots and prepares the tree for flower bud development.
Summer (December – February): This is peak flowering season. Fertilise every 4–6 weeks to keep energy levels high. Pot-grown frangipanis may need more frequent but lighter feeds, as nutrients wash out faster with watering.
Autumn (March – April): Apply one last feed before the weather cools. This helps the tree store energy in its branches and roots, ensuring it comes back strong the following spring.
Winter (May – August): Frangipanis are dormant, dropping their leaves and resting. Fertiliser at this stage won’t be absorbed, so it’s best to pause feeding until growth restarts in spring.

Always apply fertiliser around the dripline — the outer edge of the canopy where feeder roots are most active. Water in well after each application to help nutrients reach the roots and prevent fertiliser burn. For container-grown frangipanis, use a diluted liquid feed and ensure pots drain freely.

By following this seasonal routine with Complete Grow’s NPK 20-20-20, you’ll notice stronger spring growth, fuller summer flowering, and overall better resilience against pests and leaf drop.

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3. FAQs About Fertilising Frangipani

Q: What is the best fertiliser for frangipani? A balanced fertiliser such as Complete Grow’s All Purpose NPK 20-20-20 is best. It supports root health, leafy growth, and strong flowering in one formula.
Q: How often should I fertilise frangipanis? Every 4–6 weeks during the active growing season (spring through early autumn). In pots, feed more lightly but more often.
Q: Why is my frangipani not flowering? This is often due to excess nitrogen or lack of potassium and phosphorus. Switching to a balanced fertiliser like Complete Grow’s 20-20-20 usually restores consistent blooming.
Q: Do frangipanis need fertiliser in winter? No. They are dormant in winter and don’t take up nutrients. Resume fertilising once new leaves appear in spring.
Q: Can I use lawn fertiliser instead? Lawn fertiliser is too high in nitrogen and will give you leaves at the expense of flowers. Always use a balanced fertiliser designed for all-round plant health.

Final Recommendation: For frangipanis to thrive in Australian gardens, a balanced fertiliser is essential. Complete Grow’s All Purpose NPK 20-20-20 provides the perfect ratio of nutrients and trace elements to deliver lush growth in spring and masses of fragrant flowers through summer.