Unlock healthier soil, stronger roots, and bigger plant yields—naturally.
Super concentrate Bio-stimulant & natural chelating agent - with natural stimulants, minerals, and nutrients. Super concentrate, premium Fulvic acid-based product. A powerful bio-stimulant containing more than 75 minerals, humic acid extracts, and natural plant stimulants. This unique formula, a ‘Trade Secret,’ was invented by Plant Doctor’s founder, Daniel Fitzhenry, with remarkable results. Stimulizer is widely used by hydroponics growers and professional growers across Australia and worldwide. It provides an immediately available form of food for plants and soil microbes, essential for healthy soil. Stimulizer effectively eliminates root rot diseases under certain conditions and stimulates root growth in a way that no other known product can. Compatible with both acidic and alkaline materials, Stimulizer is one of the most valuable inputs for creating a healthy, well-balanced soil environment for plants to thrive. Often referred to as the ‘missing link’ in plant nutrition.
Used by hydroponic experts, landscapers, and commercial growers across Australia, Stimulizer is the secret weapon behind fast-rooting cuttings, rapid recovery after stress, and yield bumps that speak for themselves. It blends effortlessly into any garden or crop program and makes everything you apply, fertilisers, sprays, tonics, work harder and smarter. Once you try it, you’ll wonder how you ever grew without it.
Nutrient Profile:
Why choose Stimulizer:
(STM)
Fulvic acid binds to locked-up minerals, making them instantly plant-available (even within 4 hours)
Stimulates root hair development and cell elongation, giving plants deeper access to nutrients
Opens stomata to improve energy conversion, especially in cloudy or humid conditions
Reduces harmful microbes (e.g. Pythium) and boosts beneficial microbial populations
Increases resistance to pests, wilting, and environmental stress
Improves flowering, brix levels, and fruit set through increased nutrient absorption
Helps break down chemical residues (herbicides, pesticides, heavy metals) and stabilises nitrogen (urea)
| Key Bioactive Components: |
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| Derived From: | Plant-based extracts, fermentation-derived bioactives, and natural organic compounds |
| Mode of Action: |
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Stimulizer works through a unique combination of chelation, microbial stimulation, and cell signalling that improves plant and soil function from day one. Stimulizer functions as a highly bioavailable fulvic acid complex with a cation exchange capacity (CEC) of 1500—making it one of the most effective natural chelators available. Its low molecular weight allows rapid translocation of micronutrients through plant cell membranes, often within 4–6 hours of application. By stimulating root exudation and microbial colonisation in the rhizosphere, Stimulizer enhances enzymatic activity, nutrient cycling, and overall soil biofunction. The formulation also supports stomatal conductance and chloroplast activity, boosting photosynthetic efficiency even under abiotic stress such as cloud cover, salinity, or heat.
| Type | Rate | Frequency |
|---|---|---|
| Watering Can | 2ml (40 drops) per 9L watering can | Apply fortnightly or when required. Does not burn or damage the plant, lawn or soil if over-applied, but works best at lower rates. |
| Broadacre | 780ml per hectare | |
| Hydroponics | 360ml to 1000L of water | |
| Turf - Foliar | 290ml/Ha | |
| Vineyard - Foliar | 400ml/Ha | |
| General - Foliar | 3ml/100sqm | |
| Frequency |
Download Application Rates Document or please refer to the rear label for application rates.
Not sure how much to apply for your lawn or garden area? Use our Plant Doctor Product Rates Calculator to get the correct rate tailored to your size and conditions.
Yes, Stimulizer can be used with all liquid inputs including PGRs (Plant Growth Regulators), herbicides, and foliar sprays to improve uptake. We recommend conducting a small jar test first and applying to a test area before full-scale use.
20 drops of Stimulizer is equivalent to 1ml.
Stimulizer is a powerful bio-stimulant that improves nutrient uptake, boosts root development, enhances microbial activity, and improves soil moisture retention. It acts as a natural chelating agent and soil conditioner.
Apply every 2–4 weeks, or more frequently during periods of stress or high growth. Stimulizer is effective year-round in Australian conditions.
For lawns and gardens, apply 10–20ml per 100m² diluted in water. For hydroponics and foliar application, use at 1–2ml per litre of water. Always trial first before broad use.
Yes, Stimulizer is safe and effective for all common Australian turf varieties including buffalo, couch, kikuyu, and zoysia.
Yes, Stimulizer enhances the effectiveness of most fertilisers by improving nutrient uptake and reducing lockup. It’s particularly effective with liquid and granular fertilisers.
Stimulizer is not certified organic, but it contains natural humic substances, minerals, and plant stimulants derived from ancient deposits and natural sources.
Yes, Stimulizer is widely used in hydroponics to improve nutrient uptake and root health. It is compatible with acidic and alkaline nutrient solutions.
Yes, once the treated area has dried, it is safe for children and pets to return to the lawn or garden.
Stimulizer contains over 75 minerals, natural humic and fulvic acid extracts, and plant-based bio-stimulants. It is formulated to stimulate root growth and support soil biology.
Amount of Reviews:
Shop with confidence knowing your purchase is backed by our 100% 90-day money back guarantee. If you're not completely satisfied, simply contact us within 90 days for a refund.
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Australian Owned
Australian family owned and operated. Online sales since 2009.
Flat Rate Shipping
Flat-rate shipping from $9.95* Fast and affordable!
$9.95 orders under 1kg/1L • $14.95 orders up to 50kg • $49.95 orders over 50kg.
Does not include express. Some location exclusions apply.
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First time owning lawn. Gave the team at plant doctor a ring and they supplied me with a wealth of information. Products turned up quickly.
Will definitely be getting more 8 weeks difference been using stimulizer, activ8mate, soil wetter, seaweed secrets and champion fertiliser. Was super fast delivery.
Only have great things to say about Plant Doctor. Organic products and a competitive price, fast shipping and easy to contact with questions. Have had great results with the special mix for lawns, and my plants (indoor and outdoor) love the seaweed secrets. I am excited to test out some of the animal products soon!
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