Australian Guide to Using Seasol Like a Pro

Seasol is a natural and organic seaweed-based solution that can provide your plants with a wide range of benefits.

Seasol contains a unique blend of Bull Kelp, Chile Bull Kelp, and Knotted Kelp.

If you’re considering using this product to keep your garden or backyard looking its best, check out our guide below.

What is Seasol?

seasol bottle 4 | Plant care

Seasol is a liquid organic seaweed plant tonic that benefits the health and growth of plants.

It’s made from a blend of liquid seaweed extract and other organic ingredients.

This makes it perfect for gardeners who want to avoid harsh chemicals or fertilisers that may damage certain plants.

What makes Seasol special is its unique profile of bio-stimulant trace elements, acids, and nutrients which stimulate root development and help build plant strength against disease and stress.

What type of plants will benefit from Seasol?

Seasol is great for all plants, including lawns, fruit trees and vegetables.

In fact, it can also be used on any shrubs, flowers or ornamentals in your garden.

It’s also perfect for indoor plants as well as your native and exotic varieties.

Seasol works great on:

  • Trees
  • Veggies (including herbs)
  • Fruits
  • Flowers
  • Shrubs
  • Houseplants (indoors)

When to apply Seasol

Unlike fertiliser, Seasol can be applied at any time of the year and at any time of day.

It can also be applied in any weather conditions, including on very hot or cold days or when it is wet.

How often should you apply Seasol?

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For established plants, ferns and lawns apply every 2 – 4 weeks throughout the year.

For newly laid lawns, apply once per week (maximum) for 3 – 4 weeks or until well established.

While you can use Seasol at any time of the day, we suggest applying in early morning before the sun is at its hottest or after sunset when evaporation rates are lower.

It’s best to stick to the above guidelines for application frequency, but keep in mind that Seasol is not a fertiliser so it won’t burn your plants, even applied regularly.

How much Seasol should you use?

The application rate varies by plant.

Here are the recommended rates:

  • Ferns and indoor plants: 20ml per 9 litres.
  • Vegies, herbs, annuals, and established gardens: 30ml per 9 litres.
  • New lawns: 50ml per 9 litres (with a higher frequency than established lawns).
  • Established lawns: 100ml per 9 litres.

How to use Seasol

There are many ways that you can apply Seasol to your yard.

If you are using the regular concentrate, make a mix using the above measurements, and then use a sprayer to apply to your garden.

You can also use the Seasol hose-on product which attaches directly to your hose, so you can then water your lawn or plants with a mixture of water and Seasol. Each container should last around 10 minutes.

The video below provides a full guide on the Seasol Hose-on product.

Applying Seasol to specific plants


To encourage root development, apply Seasol to roses at planting time and then periodically through the year. Use 30mL of Seasol per 9 litres of water.


If you’re planting citrus, water in first with Seasol to stimulate root growth then regularly through the year. Citrus will also benefit from a complete fertiliser in Spring.

Keep in mind that because citrus trees are shallow-rooted, they need to be planted where their roots will not compete with nearby grass or weeds for water and nutrients.

Potted Plants

The easiest way to apply Seasol to potted plants is by using the “Seasol Pots & Plants” product which includes a convenient spray applicator.

Check out the video below for a full guide on caring for potted plants with Seasol.

seasol bottle 4 | Plant care

Seasol FAQs

Is Seasol good for new plants?

Yes! It encourages strong root development and can even help plants recover from transplant shock.

Can you put too much Seasol on plants?

When compared to stronger products like fertiliser, it is very difficult to do damage with Seasol. However, it’s best to avoid using an excessive amount, especially on young or newly transplanted plants that may cause a nutrient imbalance in the soil.

Is Seasol good for tomato seedlings?

Seasol will improve the quality of your soil and promote strong root development, helping give tomato seedlings a head start before planting out into the garden.

Does Seasol stimulate root growth?

Yes, Seasol helps stimulate new root development and encourages strong healthy growth.

What is Seasol good for?

Seasol helps stimulate root development, promote flowering and fruiting, and build plant strength against disease and stress.

Is Seasol a fertilizer?

Seasol is not technically a fertiliser. Fertilisers (like Seasol Powerfeed) contain common 3 elements: nitrogen, phosphorus, and potassium. However, Seasol only includes small amounts of nitrogen and phosphorus.

Photo of author

Steve Kropp

Based in Melbourne, Steve's passion is vegetable gardening, and he’s been writing about it for almost 5 years. He also loves all things DIY and is always looking for a new project. When not working on his own garden projects or blogging, Steve enjoys spending time with his family, cooking meals with produce harvested from his garden, and coaching his son’s footy team.


2 thoughts on “Australian Guide to Using Seasol Like a Pro”

  1. I have a ready mixed green container of Seasol, for fertilising my newly resown lawn.

    I have used half the bottle. Can I keep the bottle with the Seasol in it and repeat the procedure next week?

  2. Magic website. Went looking for plant info and found not only what I wanted but heaps more to help my other plants. Totally unexpected. Well-written, easy to understand and follow. Thank you!


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