What is the Best Fertiliser for Star Jasmine?

Star jasmine (Trachelospermum jasminoides) grows best with a balanced fertiliser that supports leaves, roots, and flowers equally. The ideal choice is a 1:1:1 NPK fertiliser, which fuels glossy green foliage, healthy root systems, and abundant white blooms. In Australia, the most effective option is CompleteGrow All Purpose Liquid NPK 20-20-20, applied at 4 ml per litre of water during the growing season. It provides instant nutrition, making it the best fertiliser for both in-ground and potted star jasmine.

At a Glance: Feeding Star Jasmine

Best fertiliser: CompleteGrow All Purpose Liquid NPK 20-20-20
Rate: 4 ml per litre of water
Frequency: Every 4–6 weeks in spring and summer
When: First in early spring, then after flowering flushes
Where: Apply to root zone (avoid dry soil)

Quick Fix: Pale leaves, thin growth, or poor flowering? Feed with CompleteGrow 20-20-20 to restore balance fast.

Why Balanced Fertiliser is Best

Star jasmine requires more than just nitrogen for growth. While nitrogen greens leaves, the plant also relies on phosphorus for strong roots and potassium for repeat flowering. A fertiliser that lacks balance can create problems: too much nitrogen causes lush leaves but no blooms, while too little potassium weakens flowers and increases stress during heat. That’s why a balanced fertiliser like CompleteGrow 20-20-20 outperforms single-nutrient products — it provides everything the plant needs in one simple application.

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When and How to Feed Star Jasmine

Timing is just as important as fertiliser type. Star jasmine follows a seasonal cycle of spring growth, summer flowering, and winter slowdown. Feeding in line with these stages maximises results:

Spring: First feed to wake the plant from winter and promote vigorous new shoots.
After flowering: Second feed to encourage repeat blooms and prevent exhaustion.
Late summer: Optional light feed if leaves look pale or plants are growing in sandy soils.
Autumn–winter: Feeding is usually paused as growth slows.

Feeding In-Ground Plants

Pre-water the soil so roots are moist.
Mix 4 ml CompleteGrow 20-20-20 per 1 L water.
Apply evenly at the dripline (where feeder roots sit).
Mulch 5–8 cm thick to lock in moisture and nutrients.

Feeding Potted Plants

Use premium potting mix with good drainage.
Feed every 4–6 weeks during spring and summer.
Water until a little drains from the base to flush salts.
Refresh the top 3–5 cm of soil yearly to keep nutrition steady.

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Extra Feeding Tips for Star Jasmine

Sunlight matters: Fertiliser works best when vines receive 6+ hours of sun.
Always pre-water: Feeding dry soil can damage roots and reduce uptake.
Combine with pruning: Light tip pruning after flowering, followed by feeding, produces bushier growth.
Check drainage: Yellow leaves often mean waterlogging; fix soil before fertilising again.

CompleteGrow Recommendation

The most effective way to feed star jasmine is with CompleteGrow All Purpose Liquid NPK 20-20-20. Its balanced 20-20-20 formula provides equal parts nitrogen, phosphorus, and potassium, ensuring faster coverage, stronger roots, and reliable flowering. Apply at 4 ml per litre of water in spring and summer, or every 4–6 weeks in pots, to keep your plant looking lush and productive.

Extended FAQs

What is the best fertiliser for star jasmine? A balanced liquid fertiliser like CompleteGrow 20-20-20, which provides instant nutrients for roots, leaves, and flowers.
How often should I feed star jasmine? In-ground plants twice per year (spring and after flowering); pots every 4–6 weeks during warm months.
Can I use slow-release pellets? Yes, but supplement with liquid fertiliser for faster results and quick correction of deficiencies.
Why are my star jasmine leaves yellow even after feeding? Check for poor drainage or uneven watering — fertiliser only works if roots are healthy.
Should I fertilise during winter? Not usually. The plant grows slowly in cold months, so wait until spring for the next feed.
Does fertiliser help flowering? Yes — potassium in CompleteGrow 20-20-20 strengthens blooms, while balanced nitrogen and