Premium Liquid Humic Acid Soil Conditioner for Healthier, Fertile Soil
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.
Why Choose Quantum H?
Rebuilds damaged or depleted soils
Boosts water retention & soil structure
Feeds beneficial microbes and unlocks nutrients
Binds harmful residues (salts, pesticides, herbicides, heavy metals)
Improves root development and nutrient uptake
Compatible with most fertilisers and crop inputs
Organic, clean, and easy to apply
Who It's For & How to Use It:
Lawns (Buffalo, Couch, Kikuyu & More)
Helps recover from poor soil, drought, or compacted turf
Boosts nutrient efficiency when combined with fertilisers
Improves root development and water penetration
Apply after scarifying, aeration, or topdressing
Use with seaweed or wetting agents for a complete soil program
Gardens (Veggies, Flowers, Trees, Pots)
Detoxifies urban garden beds from chemical residues
Recharges depleted potting mix and garden soil
Enhances water-holding capacity—especially important in raised beds and sandy soil
Mix with compost tea, fish hydrolysate, or seaweed for added biological benefits
Farms & Larger Properties
Ideal during pre-planting, side dressing, or fertigation runs
Helps buffer pH, reduce nutrient lock-up, and bind salinity
Improves performance of applied fertilisers (especially phosphorus and trace elements)
Stimulates beneficial microbe populations and humus formation
Useful in regenerative agriculture and carbon farming programs
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.
The Science Behind Quantum H
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:
Humic acids – large, complex molecules that improve soil structure and nutrient retention
Fulvic acids – smaller, water-soluble molecules that chelate nutrients and facilitate their rapid absorption by plant roots
Humin – the least active, most stable fraction of organic matter
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.
Function
How It Helps
Chelation & Nutrient Release
Breaks bonds that lock nutrients in the soil, making them available to plants
Water Retention & Soil Structure
Improves porosity and reduces runoff, helping roots access more water
Microbial Activation
Feeds soil microbes that break down organic matter and cycle nutrients
Soil Detoxification
Binds and neutralises heavy metals, herbicide residues, and excess salts
Carbon Source
Supplies organic carbon critical for soil biology and humus formation
Root Support
Encourages deeper, more fibrous root growth for better drought resilience
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.
Product Summary
Value
Product Type
Liquid Humic Acid Soil Conditioner
Source
Leonardite (natural organic deposit)
Best For
Soil repair, detox, nutrient unlocking
Application
Soil drench, fertigation, foliar compatible
Organic Status
100% Organic; sustainable & biodegradable
Origin
Made in Australia
If your soil is compacted, tired, chemically stressed or nutrient-poor, Quantum H is your reset button. With every drop, you’re restoring balance, feeding life back into the ground, and giving your plants the foundation they need to thrive.
Safety Guidelines
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.
(29800)
Product Application
APPLICATION RATES
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.
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Amount of Reviews: 106
Awesome products
By: jade on 13 November 2024
Can’t believe how good my lawn is looking 12 months into using plant dr products. Currently using 5 products and my lawn is mint. Every time I look at it I get tingles in the loins region!
Quantum H
By: Bryce on 10 November 2024
Recently we have had warmer weather combined with some high winds and QuantumH has really helped get the most nutrients out of my soil whilst helping retain some moisture in these tougher times! Couldn’t be happier with the results from this product!!
Good stuff
By: Jeremy on 21 October 2024
Been using this one in combination with a few other PlantDoctor products to help repair and bring life back to a struggling and somewhat neglected lawn. Couldn't be happier how fast it's bounced back and looking solid and healthy for summer!!
Fantastic product
By: Yogesh on 15 August 2024
I ordered this product after recommendations from various YouTubers who achieved amazing results from using this. I am really excited to try this on before spring kicks in this year. Delivery was super quick. Thanks guys ..
Quantum H
By: Bruce on 29 June 2024
I have used this product in combination with 5 other Plant Doctor products for the past four years and my Sir Walter lawns are pretty spectacular. The service and delivery are both prompt and efficient.
Much needed soil revitalizer
By: Lucas on 16 May 2024
Quantum H helped revitalize my otherwise dead clay soil, can't recommend enough!
Good for the soil
By: Dario on 7 May 2024
Have noticed a huge improvement all round in my garden after applying this specially on sections that were struggling before.
Awesome Product
By: Dario on 1 April 2024
I love every product from this company. I use them both for home and for my business
Feed the Microbes
By: Gavin on 15 March 2024
We all know that microbes are the best for an organic garden so I use this as food for them and help improve the soil
LUSH AND GREEN
By: Tanya on 6 February 2024
Love this product, made my new lawn from light green to a bright vibrant green in only two applications! Highly recommend. Purchased as part of the Lawn Lovers Pro Pack.
Great team and product
By: Brett on 29 January 2024
I bought the 10L as it represents great value. I am super impressed by the results, i have combined with seaweed secrets and stimulizer. I am 100% placing more orders and recommending to friends and family.
Another great product
By: Gavin on 24 November 2023
Great way of feeding microbes and creating nutrient dense food
Healthy plants
By: Steve on 23 November 2023
I had a few issues with a couple of plants that seemed to be struggling, including water logged. After applying this product, within a month I noticed new health fresh growth that has absolutely turned my garden around for the better
Quantum h
By: Jack on 11 November 2023
Great product
Top Quality
By: Justin on 25 October 2023
I've been using Plant Doctor liquid fertilizers for some time now, and I can't fault them. They are of a high quality, and make my lawn look exceptional. I use Quantum H regularly on my lawn, and you can see the difference!
Quantum H
By: Sharon on 13 October 2023
Fantastic product. I love it. Just adds that extra something to my fertiliser mix
HUMIC
By: Timothy on 8 September 2023
I use Qantum H as apart of the Lawn Lovers bundle. Humic acid helps keep your soil healthy!
Great Product
By: Bradley on 31 August 2023
Great product at an even better price!
top notch
By: David on 3 August 2023
Fantastic product to help in the conditioning of my sandy soil profile. value for money!
Little goes a long way
By: Adam on 25 May 2023
This product does wonders for the lawn, you can really see the difference after a couple of applications
Great stuff
By: Joshua on 17 April 2023
First time using a product like this. Have to say combined with everything else my lawn is thriving! great stuff
Keen to use!
By: Jessica on 22 January 2023
The post was quick. Clean. Well packed. Thank you
Great Product
By: Joel on 1 January 2023
Excellent results on my Kik in SEQ, very quick postage and great communication, highly recommend
Grass looking better than ever.
By: Stephen on 20 December 2022
I watch a lot of lawn videos and a lot of them have been using this. I thought I would give it a go as I have very sandy soil that really is lacking in goodness. After a week I can already see the difference! Why did I wait so long. Do yourself a favour, try it. You won't regret it. My eyes are opening to grass greatness!!!!
5 star praise
By: dion on 27 September 2022
First time taking on a lawn reno and with help and guidance from the plant doctor my lawn is looking amazing.
This stuff is so easy to use with simple application instructions right there on the bottle you will get results in no time at the fraction of the price
Humic acid
By: Jason on 22 July 2022
Again another quality product at a good price..
Humic acid
By: Jason on 22 July 2022
Again another quality product at a good price..
Brilliant product for soil amendment
By: Dean on 14 April 2022
I had issues with consistency in soil qaulity but after applying Qauntum H lawn looked great!
Really works
By: Daryl on 24 March 2022
Great product, improves soil and makes lawn (santa ana) look green and healthy when used with other plant doctor products
Amazing Green Zoysia
By: David on 23 March 2022
I use the Plant Doctor Quantum on both my Empire and Augusta Zoysia in conjunction Natures Soil Wetter, Liquid Iron, Stimulizer, Seaweed Secrets and Activ8Mate and they bring a depth of healthy colour to my lawn that I have not seen with any other combination of products that I've tried
Quality
By: Adam on 8 March 2022
Quality product! Have used on both my lawn and plants and can really notice the difference this makes! Plants and lawn are a lot healthier!
Great product!
By: Charles on 2 March 2022
Gave the lawn the suggested amount and it's come up thick and green within a month, even in areas where it struggled to grow before. Will be buying more!
Great all-rounder!
By: Jarod on 16 February 2022
Great all-rounder!
Loving this !!
By: Vincent on 20 January 2022
Works a treat. Lawn has never looked better. Easier to use when compared to using the powered humic acid. Free shipping with orders over $59 is the icing on the cake.
Awesome Product
By: Mitchal on 15 January 2022
Does everything as described.
Versatile foliar spray
By: Colin-John on 11 January 2022
I needed to buy a bigger bottle this time as I ran out. Quantum H and seaweed secrets are so versatile I spray them on everything: the lawn, fruit trees, strawberries. And I get great results.
Quick to arrive
By: Andrew on 11 January 2022
Ordered some Quantam H (20L) in a bundle. Arrived the same week. Highly recommended
Lush!
By: Aiden on 26 December 2021
Ran out of this product for a few weeks and wow did i notice a difference now i have stocked up again even just 2 applications down and the lawn is back to stunning results (maintaining soil moisture for longer, density and all round health of the plant) highly recommend this product.
Great product
By: Nick on 23 December 2021
Used with other plant doctor products to make a real difference to the garden
Great
By: Rowan on 22 November 2021
Been applying this with my Ben Sims mix with great results.
Great product
By: James on 25 October 2021
Great addition to my lawn arsenal! Great price too!
Rich soil
By: Alex on 15 October 2021
Another great soil conditioning product when mixed with seaweed secrets and Stimulizer, has helped fix many issues I had with a new lawn area.
Quantum H
By: Greg on 30 September 2021
Combined this with the other Plant Doctor products and have made a huge improvement on my lawn. Awesome product
Quantum H
By: Douglas on 27 August 2021
Thank you Adam for the quick service and delivery. You have a new client here, very happy !
Awesome product
By: Gurinder on 13 July 2021
Heard a lot about Humic acid benefits. So got this to try. Looking forward to see results.
Must have product!
By: Shoua on 4 June 2021
QH is a must have product in your garden shed. I make it a point to mix this liquid solution with Seaweed Secret and Stimulizer to get super results and the magic blend has never failed me thus far. Plus, its an organic product that I use on my little vegetable patch too.
Lawn repair
By: Colin-John on 25 May 2021
I'm using Quantum H with an oversow to repair dog urine damage to the lawn. The germination was fast and I'm already seeing some improvement with the damaged patches reviving the existing grass plants.
Liquid Gold !
By: Tim on 14 April 2021
I have only applied this several times and I can notice the improvement to the soil in my vege garden already.
A++ liquid humic acid for lawn n plant
By: Anferny on 31 March 2021
Love this product because so easy to mix in with any application for your lawn or your home vege n garden plant. And very cost effective product.
Great on the Lawn
By: Blake on 26 March 2021
Does wonders to get the lawn back after serious heavy rain and fungal infection.
Quick Delivery
By: Wasim on 23 March 2021
This humic acid comes at a good price and next day delivery. I will mix this in with seaweed and fulvic acid, as well as one other liquid fertiliser, for a balanced improvement in my plants.
Fantastic!
By: Chris on 3 March 2021
The best liquid humic product going around
Awesome product
By: David on 20 February 2021
Didn't even know what humic acid was a few weeks ago but I believe this with a combination of other products really helps your lawn be the best it can.
absolutely great product
By: Steve on 28 January 2021
quantum h is a very very good product for my tiff. Adam is a wealth of knowledge and products like this are liquid gold
Sensational mix
By: Tyler on 4 January 2021
I purchased the Ben Sims Lawn Tips pack for my instant turf couch and all of the products have been sensational. The improvement in my couch at a former residence, in which I did not use these products, and the couch at our new place, in which I use these products, is 10 fold. Very happy.
Great products from PD
By: Karan on 4 January 2021
I have been using this on recommendation with other products from PD. The lawn looks fantastic. Recommend applying every 2-4 weeks.
Get the your Humic on!
By: Mitchell on 1 December 2020
Helps improve your soil structure by adding carbon and organic matter whilst helping retain water. Can be easily blended with other products to make up your secret mixes and provides excellent results!
Special Mix Product 5
By: RON on 17 November 2020
Another product I use in my special mix. Just purchased 20L as my 4L had run out. Made up a special mix this afternoon and applied to Gardens.
A must
By: Scott on 15 November 2020
I have been using Quantum H on my lawn since my lawn reno. I cannot recommend this product enough - it has definitely helped improve the root system of my buffalo.
Very happy with the results
By: Chris on 12 November 2020
I received this as part of the Ben Sims mix and wasn't exactly sure on what it did. But when I used the mix as described the soil health improved immensely. I have very poor drainage and horrible soil and this, along with the rest of the Ben Sims mix has turned it around. Lush soil full of the right microbes and a near perfect PH. Very happy indeed!
Plant Doctor's humic acid Is The Best
By: Sunny on 9 November 2020
I always watch Ben Sim's show and do what he says, this is one of the best product I have used, I am a fan of liquid ferts. Easy and effective.
Quantum 5 stars
By: mason on 7 November 2020
Excellent product really helped my newly seeded lawn reach it's full potential in no time absolutely would recommend
Great Product
By: Benjamin on 26 October 2020
Have been using Quantum H after following Ben Simms at Lawn tips. Have used on my lawn but also on all my other plants with great effect.
A must have
By: Troy on 15 October 2020
Always add this to my seaweed secrets and activate mate and use on my grass and gardens.
Humic Acid
By: Martin on 11 October 2020
Used on the lawn with soil wetter, seeing great results
Great product
By: Adam on 23 September 2020
I use this on my lawns, garden beds and veg beds, great product at a fantastic price.
Hope it does works as advised
By: Vijayant on 19 September 2020
Have used this product in conjunction with Activ8mate and seaweed secrets. To be honest I can't really tell if it makes any difference but the reviews were good, hence decided to try it out.
Humic Magic
By: Geoff on 3 September 2020
I have been using Quantum H for about 12 months now and the difference is striking. Initially I was using it on my lawns with other Plant Doctor products but I now use it on the gardens also. Soil quality has dramatically improved and the plants have never looked better. I recently had to dig up some irrigation for repair when I noticed how rich the soil looked, it even smelled rich. A game changer.
Great product
By: AC on 9 August 2020
I’m definitely buying this again!
Amazing results.
By: Brandon on 23 July 2020
Got it in my Ben Sims pack. Absolutely stoked with the results
Super booster
By: Alisha on 8 July 2020
After using this product my indoor plants looked neon green and vibrant. I could literally see the nutrients had been absorbed and are super effective.
Great Product
By: Aaron on 21 June 2020
This stuff is great, strongly recommend to anyone who wants to improve their soil. Works very well!! Will be a product I use permanently now with my lawn and gardens.
Supercharge your soil health!
By: Ben on 18 June 2020
Another fantastic organic rich product from Plant Doctor. I've been using this product to improve my soil health over the past few months and it has resulted in a vast improvement in my soil condition. Brilliant product!
Amazing product.
By: Christopher on 9 June 2020
Blown away with how much quantum H has improved both my soil and the growth rate of my newly overseeded lawn. I definitely recommend this product to anyone looking to boost the quality of their soil and lawn in general.
Perfect for newly laid turf
By: Luke on 25 May 2020
Threw this on my newly laid front lawn and within seven days the turf had already developed root growth into the top soil.
Healthier Looking Lawn
By: Craig on 20 May 2020
I have used this product now a couple of times and I have a visibly healthier looking lawn. I'm impressed, and my soil approves too!
Easy application, full confidence
By: Tracey Pate on 15 May 2020
This is the perfect solution for me to use with a sprayer. I was undecided about whether to granules or liquid, but am so pleased I went with this one. It's great that it comes in a range of sizes. Now that I've tried the 1L and know that it works for my application (vegetable beds - 100sqm) I can go up to the next size next time.
Awesome Stuff!
By: Brad on 8 May 2020
My lawn has never looked so green and healthy! A must have.
Results plus
By: Jacob on 2 May 2020
Is definitely a must in your lawn products
Quantum-H
By: Sean on 30 March 2020
Great booster for your lawn
Quantum H
By: Steven on 29 February 2020
Great for improving soil, love using this stuff
Quantum H
By: Phil Gilmore on 9 January 2020
Plant and lawn quality is only as good as the soil they grow in. I find Quantum H provides the balance that allows the lawn to absorb everything on offer. Just bought another bottle!
Good product
By: Giang Le on 9 January 2020
Good product. Does what it says it will do
Healthy soil
By: Samual Anderson on 5 January 2020
I have noticed a huge difference root growth and plant health after adding to my mix to stand up to stress and diseases
Great for soil
By: Aaron on 24 November 2019
This has helped improve my overall soil quality. Goes a long way as well! Going to be a regular product on my lawn.
Quantum H ® - A premium humic acids liquid solutio
By: Dale on 4 November 2019
Appeaed to work great as part of my mix of Ben Simms pack.
Left the iron out and applied separately.
Damian Louw
By: Damian on 4 November 2019
I used this product on soil that was very neglected and the newly laid lawn took to it extremely well. The results where much better then expected
Humic Acid
By: Jack Deen on 23 October 2019
Awesome product - my soil health is so much better and even when I need to dig in certain areas, this product has made my soil less dry and solid and better for roots to establish in
Fantastic
By: Alexandra on 22 September 2019
Liquid gold. My lawn looks so healthy only after a couple of weeks using it. Fanbloodytastic
Great
By: Aaron on 20 September 2019
Used this as it was recommended by Ben Simms, great product! Seeing definite improvements in the quality of my lawn.
Healthy Lawn
By: Michael on 20 September 2019
After just one application so far of Quantum H my lawn already appears healthier, and it's comforting to know that all the hard work's being done below the surface. Easy to apply together with seaweed concentrate and liquid fertiliser. Great product, and speedy next day delivery.
Mix it together!!
By: Paul on 18 September 2019
Can’t wait to give this a try and add it to my already amazing mix of turf goodness
Stronger than ever
By: Aaron on 11 September 2019
This combined with some seaweed secrets, I cant promote my root growth enough, fantastic product
Great for soil health
By: Kris on 24 August 2019
Easy to apply and has been great for improving soil health and strong roots in newly seeded perennial ryegrass.
No more blocks!
By: Rhys on 20 August 2019
All the benefits with no application issues! Really helped add nutrients to my clay soil.
So Easy to Use
By: Tom on 19 August 2019
This liquid humic acid is great for saving time when I am trying to mix up on site. Unreal value for money and a great result on all of the lawns that I service.
Highly Reccomended
By: Brett on 11 August 2019
Was recommended this product around 6 months ago and very happy with the results that i have had since using it. Would highly recommended.
Easier than mixing powder!
By: Jacob on 18 May 2019
I was using a powder humic acid in the past with a paint mixer attached to my drill. This worked but required a bit of extra work. Thought I'd give this liquid a chance and I'm glad I did.
Great soil conditioner
By: Jason on 18 April 2019
Great speed of delivery, and I have noticed the an improvement in my lawn after using Quantum H. Very happy will continue to use.
Next level
By: Shayne on 11 April 2019
This stuff is fantastic. I have predominantly clay based soil and mixing this with nature’s soil wetter has given amazing results.
Get On Board
By: Stephen on 29 March 2019
If you’re not aware of the necessities of humic and fulvic acid for soil health, now’s the time to get on board! I love this product, and over a short time my hard clay soil has softened and my lawn is thriving
Great for lawn health
By: Matthew on 23 March 2019
This stuff is awesome, really noticed the difference to lawn health since I started applying it. Highly recommended! Delivery was lightening quick..
A+
By: Emma on 13 December 2018
I have been using this product with Natures Soil Wetter. Have achieved great results!
Great product, highly concentrated
By: Tony on 30 November 2018
I chose to use the Quantum H as a complimentary measure to Seaweed Secrets. I understood the need for soil conditioning, but also the need to have plant nutrition available on demand and without leeching. Humic and Fulvic Acids help regulate soil ph, bind elements that are not desirable such as by products of synthetic applications/products and provide valuable carbon as well. As a novice, do research into the proven scientific and peer reviewed benefits of Humic and Fulvic Acid.
Well worth investing in.
Excellent Product
By: Ashley on 13 November 2018
Been using on both garden and lawn with great results. Both lawn and garden have never looked so healthy. I highly recommend this product, you won't be disappointed.
Top Quality
By: Mathew on 4 November 2018
I use this with Natures Soil Wetter. Have achieved great results!
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Customer Reviews
5
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.
Billy Green
5
Will definitely be getting more 8 weeks difference been using stimulizer, activ8mate, soil wetter, seaweed secrets and champion fertiliser. Was super fast delivery.
Michael Preddy
5
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!
