Organic Plant-Health Seaweed Tonic Concentrate

A powerful pick-me-up for weary plants or young seedlings.

item: C220
27 reviews
Was $13.90
Buy 2 (Save 5%) Pay $11.88/ea
Buy 3 (Save 8%) Pay $11.51/ea
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Product Info

Hoselink’s Plant-Health Seaweed Tonic Concentrate is made from a combination of kelp seaweed and soluble potassium humate which helps plants to grow more vigorously, enriches the soil and stimulates flowering and fruiting.

Packed with minerals and nutrients, seaweed is high in complex carbohydrates essential for assisting with healthy plant growth and defending plants from soil-borne diseases. Though rich with minerals, the Seaweed Tonic has small quantities of such nutrients, making this formula safe and gentle enough for use on delicate plants and seedlings, as well as for regular plant health maintenance.

The fast-acting formula works effectively whether applied directly to the soil or to the foliage, as plants can absorb food directly through their leaves. Seaweed Tonic is suitable for use on both indoor and outdoor plants. 

Contains liquid composts that promote good soil structure – looking after your plants above and below ground! Plus, it is safe to use on all plants including natives, seedlings, flowering and fruiting plants.

Directions for Use

Watering Can

Refer to dilution rates table below. Figures based on pre-mixing in a 9litre watering can.

  1. Fill watering can with water
  2. Mix required amount of Plant Health Tonic
  3. Apply evenly over selected application

Hoselink Fertiliser Spray Mixer:

Dilution rates; 450ml of Plant Health covers 202m². *based on foliar application

  1. Shake well before use
  2. Flow reducer required - unscrew the bottle and remove the siphon tube, then unscrew brass pin from above selector dial and push into the top of the siphon tube. Reassemble.
  3. Pour concentrate into Hoselink’s Fertiliser Spray Mixer.
  4. Select dial (refer to table below) and walk slowly using a sweeping action to apply evenly to selected application.


Plant/ Application Type

Rate per 9Lt watering can

Hoselink Spray Mixer Setting

Application Frequency



1 with flow reducer

Every 1-2 weeks

Foliar Application


1 with flow reducer

Every 1-2 weeks

New Plantings


1 with flow reducer

At planting and in 2 weeks



1 with flow reducer

Every week



1 with flow reducer

Every week

Established Plants


1 with flow reducer

Every 1-2 weeks



5 with flow reducer

Every 2 weeks



5 with flow reducer

Every 2 weeks (during growing period)


Expert Tip: For the ultimate soil boost, use alongside the Hoselink Super Grow Garden Fertiliser, applying formulas 10-14 days apart.

Once diluted fertiliser is pet and child friendly. 

Proudly made in Australia.

When should I use Seaweed Tonic?

We recommend using our Seaweed Tonic 2-3 times per month for best results. Unlike with other fertilisers, Seaweed Tonic can be safely sprayed on your garden throughout the year. 

For more on how to use Seaweed Tonic, read our guide on the Backyard Living blog here.


See more Bee Friendly Collection.

Read More

Product Specifications

Typical Analysis

Contains 0.5% Potassium Hydroxide
No other reportable quantities

Product Analysis

Safety Data Sheet


What's Included

  • 1 x 1.25ltr Plant Health *Seaweed Tonic* Concentrate
  • Latest Hoselink Catalogue


Customer Reviews
4.9 Based on 27 Reviews
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1 ★
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Jim H.
I recommend this product

Both fertilisers plus spray mixer

Very satisfied great products

Jennifer S.
Australia Australia
I recommend this product

Great product

My pot plants love it. Had no problems with it being too strong for ferns.

Terrance M.
Australia Australia
I recommend this product

I have added this to the other fertiliser products you sell I purchased the fertiliser spray bottle which is terrific to use for all the garden applications I will need to purchase a flow reducer to replace the on e I lost. I am very happy with the hoselink products ..

Robert A.
Australia Australia
I recommend this product

Seaweed tonic and liquid fertiliser.

Have been using these products for a couple of weeks and can see a difference already in the health of the vegetable plants. I have just seeded my summer vegetables and I used the seaweed tonic to soak the punnets with seeds for their initial watering. Hopefully this will give them a good kickstart. Ordering process and delivery was without issue and will definitely be ordering again.

Jenny P.
Australia Australia
I recommend this product

New seaweed tonic.

Add some of this to my normal fertilizing regime & plants look so healthy & productive (veggies). I feel this tonic improves the soil, therefore plants benefit.

graeme s.
Australia Australia
I recommend this product

Brilliant product

Tracey S.
Australia Australia
I recommend this product

Seaweed tonic

There is an incredible difference in the flowering of the plants. We love using the seaweed tonic

camille j.
Australia Australia
I recommend this product


very good working so far we are getting lots of new flowers

John G.
Australia Australia
I recommend this product

As good as the smell............

Good for seedlings. Has improved look of vegetables. Pot plants seem to love it.

Margaret S.
Australia Australia
I recommend this product

I have notbeen able to use this product with the sprayer as after assembling the sprayer I could not get sprayer to work. I am sending back today, hope you can fix the bottle.

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