Orchids: How to Feed, Care & Get Blooming Results

Orchids are stunning and surprisingly resilient when given the right nutrients and environment. Whether you’re growing phalaenopsis, cattleya, or cymbidiums, this guide explains exactly how to keep your orchids healthy, flowering, and thriving—using premium Complete Grow fertilisers.

Which Orchids Need Fertilising?

All orchids benefit from regular feeding—especially during active growth and flowering. Some of the most common varieties grown in Australia include:

Phalaenopsis (Moth Orchids): Ideal for indoors. Needs consistent light feeding to encourage repeat blooms.
Cymbidiums: Cool-tolerant and grown outdoors. Heavy feeders—require regular fertiliser through spring and summer.
Cattleyas: Thrive with warmth and bright light. Feed when new growth appears and during bud development.

Light, Water & Orchid Media

Light: Bright, indirect light is best. Avoid direct sun, which can scorch leaves.
Water: Water when roots turn silvery or the potting mix feels dry. Avoid soggy roots.
Potting mix: Use a coarse, well-draining orchid mix—typically bark, perlite, and charcoal. Avoid soil or dense composts.

Avoid letting water sit in the crown of phalaenopsis orchids, as this can lead to rot. Let the pot drain fully before placing it back in decorative containers.

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What Is the Best Fertilizer for Orchids?

Orchids need low-salt, well-balanced liquid fertilisers that deliver nutrients in small, frequent doses. The best orchid fertiliser supports strong root growth, lush foliage, and abundant blooms—without risking fertiliser burn.

NPK 20-20-20 – A balanced all-purpose formula perfect for all orchid types during active growth. Feed every 2 weeks at quarter to half strength depending on season and orchid type.
NPK 4-18-38 + Cal-Mag – Ideal when flower spikes appear. High in phosphorus and potassium to encourage blooming, bud retention, and stronger flower colour.

Phalaenopsis and indoor orchids benefit from low-strength liquid feeding year-round, while cymbidiums can be fed heavily in spring and summer, then tapered in winter.

Fertilising Tips for Specific Orchid Types

Phalaenopsis: Feed year-round at ¼ strength every 2 weeks with NPK 20-20-20. Switch to 4-18-38 during bloom spike.
Cymbidium: Use full-strength feeding in spring/summer to power vegetative growth, then back off as flower buds form in autumn.
Cattleya: Feed from when new shoots emerge until blooms open. Let plants rest slightly in between flower cycles.

Is Homemade Fertiliser Good for Orchids?

Homemade fertilisers (like banana peel water or rice water) lack precision and often miss key trace elements. For safe, consistent results—especially with delicate roots—stick with high-quality liquid fertilisers like Complete Grow’s fully soluble blends.

The Complete Grow Orchid Feeding Routine

NPK 20-20-20 – Use during vegetative growth, after repotting, and for ongoing health.
NPK 4-18-38 + Cal-Mag – Switch when blooming begins to maximise colour, size, and longevity.

Explore our full fertiliser range to keep your orchids thriving all year round—indoors or out.