Quantum H isn’t just another soil additive, it’s a powerful organic soil conditioner made to repair tired, nutrient-starved, or contaminated soils and turn them into rich, living ecosystems that support healthy plant growth. Formulated from premium Leonardite ore, Quantum H delivers short-chain humic and fulvic acids that work fast to unlock nutrients, detoxify chemicals, and feed soil microbes, restoring balance and fertility from the ground up.
Use Quantum H when your soil shows signs of organic carbon deficiency, poor nutrient uptake, or symptoms of “nutrient lock-up.” It’s especially valuable for rehabilitating soils affected by chemical residues such as herbicides, pesticides, or heavy metals. In hydrophobic or compacted soils, it helps improve moisture infiltration and microbial activity. It’s also an essential input for growers transitioning to regenerative or organic farming systems, where building long-term soil health and fertility is key.
Quantum H's low sludge formulation makes it easy to handle and ideal for various application methods. Rich in bioavailable organic carbon, it supports soil biology and long-term fertility. Quantum H is compatible with most crop inputs including fertilisers, pesticides, fungicides, and biologicals, except iron-based products, which should be applied separately. It can be used year-round and is particularly effective when applied during seedling, transplanting, fertigation, or pre-planting to activate soils and boost early plant development.
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Breaks bonds that lock nutrients in the soil, making them available to plants
Improves porosity and reduces runoff, helping roots access more water
Feeds soil microbes that break down organic matter and cycle nutrients
Binds and neutralises heavy metals, herbicide residues, and excess salts
Supplies organic carbon critical for soil biology and humus formation
Encourages deeper, more fibrous root growth for better drought resilience
Quantum H is more than a soil conditioner, it's a soil activator that changes the way your soil functions at a biological and chemical level. Powered by short-chain humic and fulvic acids extracted from high-grade Leonardite ore, it enhances the soil’s cation exchange capacity (CEC), buffers pH, stimulates microbial life, and unlocks bound nutrients in the soil matrix. Humic substances are the most active component of organic matter in soil, formed through the natural breakdown of ancient plant and animal materials. Within this group are three key compounds:
Quantum H contains a high concentration of short-chain humic and fulvic acids, which are more biologically active and effective than longer-chain forms. This makes it a fast-acting, high-performance input.
| Application Type | Details |
|---|---|
| Home | 1ml per 1sqm 100ml per 100sqm Apply fortnightly or as required. |
| Broadacre | 6 - 10 Litres per hectare in enough water to provide thorough coverage or 1000 litres of water, reapplying 2-6 times during the growing season. It may be water run, side dressed, mixed with soil applied with liquid nutrients or sprayed directly on the soil. |
| Added with nutrients | Add 2-4 litres of Quantum H per Hectare mixed with the liquid nutrients. Add to a partially filled tank. Include with every application. |
| Sprinkler or Drip Irrigation | Smaller amounts may be applied in every irrigation instead of only one application. Not corrosive to pipes or nozzles and will not plug them. |
| Transplanting or Cutting | Mix 4 litres of Quantum H per 750 litres of solution. Mix well before use – Dilute in at least 1:20 in water. |
| Agricultural Specific Recommendations | Vegetables: 600ml per 100L water up to 3.5L/ha equivalent. Apply every 2 weeks or as required. Orchards & Vineyards: 600ml per 100L water up to 5L/ha equivalent. Apply every 4 weeks or as required. Ornamentals & Turf: 600ml per 100L water up to 3.5L/ha equivalent. Apply every 4 weeks or as required. Pasture: 1 – 3L/ha in 60 – 100L water. Apply as required. Broadacre Crops: 0.6 – 2L/ha in 60 – 100L water, depending on canopy closure. Apply as required. Spot-Spraying: 35ml per 10L water. Apply as required. |
| Fertigation | Vegetables: 6 – 10L/ha. Apply every 2 weeks or as required. Orchards, Vineyards, Ornamentals & Turf: 6 - 10L/ha. Apply every 4 weeks or as required. |
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.
Keep out of reach of children. May be harmful if swallowed. If eaten seek medical help. ALWAYS TRIAL BEFORE CHANGE. Before a new rate, product or application method is used, a small trial is recommended. Warranty of this material, either expressed or implied is limited to a guarantee of the composition as shown on this label in as much as uses are beyond the seller’s control. For the same reason, the seller is not liable for any injury to any living thing, crops, soils, or materials which may result from the use or storage of this material. As this is largely a mineral based fertiliser made from natural resources, the analysis may change slightly.
NOTE: Not compatible to be mixed with iron-based products. Apply separately.
Quantum H is a premium humic acid solution designed to improve soil structure, increase nutrient uptake, enhance microbial activity, and support plant and lawn health. It’s ideal for all soil types and can be used on lawns, gardens, trees, and crops.
Quantum H can be applied every 2–4 weeks depending on your lawn or garden's condition. Refer to the application rate guide for specific use instructions.
Refer to the application rate table on the product label or website for specific rates tailored to lawns, gardens, or agricultural use.
Yes, Quantum H is safe for all Australian grass varieties including couch, buffalo, kikuyu, and zoysia.
Yes. Humic acid enhances the performance of most fertilisers by increasing nutrient availability and reducing losses through leaching or lockup.
Absolutely. It pairs well with Seaweed Secrets, Stimulizer, and Activ8EXTRA as part of a complete soil health strategy.
Quantum H is made from natural leonardite sources and contains humic and fulvic acids. It is not certified organic but is non-toxic and environmentally friendly.
It helps restructure compacted soil, boosts microbial activity, improves moisture retention, and keeps nutrients available to plants longer.
Yes. In sandy soils, it helps hold moisture and nutrients. In clay soils, it improves drainage and reduces compaction.
Yes. Once the product has dried after application, treated areas are safe for kids and pets to return to.
It can be used in small amounts in hydroponics to support nutrient uptake and microbial life. Test on a small scale first.
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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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