The plant tonic launched to the home garden market in the mid-1990s and is one of the most popular consumer garden products in Australia, where Bunnings is its biggest retailer.
The company began in Tasmania and Eric Haynes, a coal miner who had emigrated from the UK, bougth it in 1984.
The organic liquid seaweed has been licensed by UK company Mr Fothergill's, which is Australia's largest packeted seed supplier. It is Fothergill's only non-seed product.
Mr Fothergill's David Turner said: "The opportunity was there and no-one else here has it."
Market leader is Maxicrop but Seasol will be priced lower and aimed at the mid market.
Turner said seaweed products are on the rise because of people switching to more natural products and that shelf space in mid-summer for them is large. He says the market is a sven figure one.
He added that the seedsmen are alomost 10% up this year after two or three static years because of good weather this spring.