Seasol seaweed concentrate 1L
Seasol seaweed concentrate 1L
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Seasol isn't a fertiliser. It's a seaweed tonic that gets plants through the tough patches, heat, dry spells and the shock of being moved.
Mix around 40mL into a 9 litre watering can and it covers a few square metres. Reapply every 2 to 4 weeks, and it also helps your plants take up fertiliser better, so whatever else you're feeding works harder.
It's safe to use year round in any weather, which makes it one of the easiest things to keep on hand in the shed.
Full specs are in the tabs below.

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The technical bits
- Pack size: 1 litre concentrate
- Type: Seaweed plant tonic (not a fertiliser)
- Mixing rate: About 40mL per 9L watering can
- Coverage: A few square metres per can
- Reapply: Every 2 to 4 weeks
- Use: All year round, any weather
- Brand: Seasol
Why gardeners swear by it
- Builds strong roots from the ground up
- Helps plants cope with heat, dry spells and frost
- Reduces transplant shock when moving plants
- Improves how well fertilisers are taken up
- Safe to use year-round in any weather
Shipping and Returns
We pack and send your order with care, right here from our Strathalbyn store. Most parcels leave within 1–2 business days, and you'll get tracking as soon as it's on the way. If you're local, you can choose click-and-collect or our delivery service at checkout.
If something arrives damaged or not quite right, let us know within 14 days and we'll sort it quickly. You can return unused items in their original condition for a refund or store credit. For safety reasons, we can't accept returns on gas bottles, cut materials, or custom orders.
We're here to make things easy, so if you ever have a question about your delivery or a return, our team is only a call away.
Why you'll love shopping with us
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Advice from real gardeners
You’re getting guidance from people who’ve killed plants, learned the hard way, and kept going.
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Products that earn their space
If it doesn’t perform consistently in local gardens, it doesn’t stay on our shelves.
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Chosen for local conditions
Our team gardens here and tests products in real soil, heat, and weather