Plant Health Seaweed Tonic Concentrate

Promotes vigorous growth & stimulates flowering

item: C220
8 Reviews
Was $13.90
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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.

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 Fertilisers.

Read More

Product Specifications

Typical Analysis

Contains 0.5% Potassium Hydroxide
No other reportable quantities

Safety Data Sheet


What's Included

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


Customer Reviews

5 Based on 8 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
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Filter Reviews:
Rosalind V.
Australia Australia

Plant health seawood tonic concentrate

Great product highly recommend

Roz M.
Australia Australia

Too early to tell but

Too early to tell but am sure the product will be great.

Mark T.
Australia Australia

My Lawn has never looked better

From the first application my lawn has never looked better. It is easy to apply and makes a huge difference in appearance and health of my lawn. Happy shopper.

Mathew M.
Australia Australia

Seaweed tonic

Great product, keeps plants healthy and green

Karen A.
Australia Australia

Seaweed green thumb

You can almost see my green veggies such as broccoli and wombok growing before your eyes. I have never had such wonderful results as with the seaweed tonic.

Jenny P.
Australia Australia

Thick & lucious seaweed Concentrate

I've used this couple of times now & haven't killed any plant!! Reality is this concentrate is really thick and I think it's excellent. As it's only couple of times that I've used this on my flowering plants & shrubs, I feel the results r slowly showing in their growth. I have to keep using it for a bit longer to give u a more positive report. Bear with me. and I have ordered more with a sprayer....gotta be good, mate.

Sylvia H.
Australia Australia

Seaweed tonic

So concentrated, it will last diluted for the whole growing season, and then some! Full of all the goodness your plants need.

Les H.
Australia Australia

I would thouroughly recomend, easy to use with Hose Link spray aplicator. Just set dial and spray. My lawn has never needed mowing so much....

Excellent, easy to use with Hose link spray applicator,

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