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Pairs well with
Higgins Plant Tonic is an Australian-made biostimulant built around cold-pressed local kelp, fulvic acids from leonardite, microbial exudates, B-group vitamins, and chelated micronutrients. A serious formula for serious growers — designed to support healthy growth, root development, and stress recovery across indoor plants, outdoor plants, lawns, and edibles alike.
Specifications
- Concentrated biostimulants are powerful at low dilution — always follow the label rate. More is not better. Overdosing kelp and fulvic blends can stress plants and burn foliage.
- Apply early morning or late afternoon for best uptake. Direct hot sun plus concentrate is a recipe for leaf burn on foliar applications.
- If you're mixing with other inputs, do a small jar test first — biostimulants are generally compatible with most fertilisers and IPM products but always confirm before tank-mixing.
How to Use Higgins Plant Tonic
Pairs Well With
The natural pair — Australian-made aroid and tropical mix from the same brand. Use Plant Tonic as a water-in tonic right after repotting.
pH & EC MetersBiostimulants nudge nutrient availability — keep an eye on your root-zone pH and EC so you know what's actually reaching the plant.
Base NutrientsPlant Tonic plays well alongside a balanced base feed — it boosts uptake of what's already in your nutrient program rather than replacing it.
Pressure SprayerA clean pressure sprayer makes foliar feeding consistent and quick — small droplets, even coverage, no clogged nozzles or splatter.
Frequently Asked Questions
Can I use Higgins Plant Tonic on both indoor and outdoor plants?
Yes — it's formulated as a general-purpose biostimulant for all plant types. Houseplants, vegetables, ornamentals, fruit trees, and lawns all benefit from the kelp, fulvic, and chelated mineral combination.
Is it safe to use alongside my regular fertiliser?
Yes — biostimulants like this are designed to complement a base feeding program, not replace it. The fulvic acid actually improves nutrient uptake from your existing fertiliser. As with any tank-mix, do a small jar test first if you're combining multiple liquid inputs.
Will Plant Tonic help with transplant shock?
Yes — stress relief and transplant shock mitigation are explicit design goals. The kelp component provides natural plant hormones that support root establishment, and the fulvic acid helps the new root zone access nutrients quickly. Water it in at the label rate right after repotting.
Can I use this as a foliar spray?
Yes — it works as both a soil drench and a foliar feed. Apply foliar in the cooler parts of the day (early morning or late afternoon) to avoid leaf burn, and use a clean sprayer for even coverage.
How often should I apply Plant Tonic?
Every 2–4 weeks during the active growing season is a good general rule, but always follow the label rate and timing on the bottle. Reduce frequency in winter when most plants are dormant or slow-growing. Apply more often during stress periods such as heatwaves, transplant recovery, or pest pressure.
Is the kelp Australian sourced?
Yes — Higgins uses Australian cold-pressed kelp as the primary ingredient. Cold pressing preserves more of the active growth compounds than heat extraction, which is part of why this formula sits on the premium end of the biostimulant shelf.
Should I get the 250mL or the 1L?
The 250mL is the trial size — perfect if you're testing the formula on a small indoor collection or just want to see how your plants respond before committing. The 1L is the everyday-grower size and works out at less than half the per-mL price of the 250mL — if you know you'll keep using it across a full season of fortnightly applications, it's the smarter buy.
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Powerful Boost, Naturally Sourced
Australian-made kelp and fulvic biostimulant. Super concentrated, versatile across indoor and outdoor plants, and built for serious growers. Free shipping over $499*.