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.
| For Lawns & Turf (Buffalo, Couch, Kikuyu & More) |
Tip: Use with lawn fertiliser to increase uptake and reduce leaching. |
|---|---|
| For Home Gardens (Veggies, Flowers, Citrus & Herbs) |
Ideal For: Pots, raised beds, garden beds, indoor plants |
| For Hydroponics & Controlled Environments |
|
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.
| Function | Description |
|---|---|
| Natural Chelator | Fulvic acid binds to locked-up minerals, making them instantly plant-available (even within 4 hours) |
| Root & Shoot Growth | Stimulates root hair development and cell elongation, giving plants deeper access to nutrients |
| Photosynthesis Booster | Opens stomata to improve energy conversion, especially in cloudy or humid conditions |
| Disease Suppression | Reduces harmful microbes (e.g. Pythium) and boosts beneficial microbial populations |
| Plant Immune Activation | Increases resistance to pests, wilting, and environmental stress |
| Yield Enhancer | Improves flowering, brix levels, and fruit set through increased nutrient absorption |
| Soil Detoxifier | Helps break down chemical residues (herbicides, pesticides, heavy metals) and stabilises nitrogen (urea)f |
| Product Summary | Value |
|---|---|
| Form | Liquid concentrate |
| Best Used For | Root growth, microbial activity, nutrient uptake |
| Use In | Soil, foliar sprays, hydroponics, fertigation |
| Compatibility | Fertilisers, herbicides, fungicides, insecticides |
| Application | All seasons, all plant stages |
| Origin | Made in Australia |
(STM04L)
| Application Type | Rate |
|---|---|
| Home | 2ml (40 drops) per 9L watering can OR 3-5mL per 100sqm |
| Broadacre | 780ml per hectare |
| Hydroponics | 360ml to 1000L of water |
| Foliar | Turf: 290ml/Ha |
| Foliar | Vineyard: 400ml/Ha |
| Foliar | General: 3ml/100sqm |
| Frequency | Apply fortnightly or when required. Does not burn or damage the plant, lawn or soil if over-applied, but works best at lower rates. |
Download Application Rates Document or please refer to the rear label for application rates.
Q: Can Stimulizer be used with products such as PGRs?
A: Stimulizer can be used with all liquid inputs, including PGRs and herbicides, etc for a quicker uptake. However, we do suggest completing a small jar test and apply the combination of products in a test area to determine whether there is an adverse effect.
Q: What is the capacity of the Stimulizer dropper?
A: 20 drops equal 1ml.
Amount of Reviews: 19
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Flat-rate shipping from $9.95* Fast and affordable! *For items 1 kilo or less, shipped within Australia. $14.95 for above 1kg. Excludes some regional areas.
*For items 1 kilo or less shipped within Australia.
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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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