Manufacturers of a liquid fertilizer consisting of cane toads say that "toad juice" bottles could explode.

Northern Territory FrogWatch, which sold 300 bottles of the juice at Darwin's Garden Spectacular said recently that the liquid inside the batch is still in the process of fermenting and may explode.

The company requested customers who have not opened their fresh bottles to turn the caps a little to let some of the pressure out; or else, the may risk getting sprayed with the sticky juice.

Graeme Sawyer, of Frog Watch, said the liquid is no longer contains any harmful poison in it.

He added, "There's no toxin left in it by the time it's been through the fertilizer process... It's an inert substance in that sense, so there's no problem there... The issue just is that because it was such a fresh batch, it's still producing gas. "

Sawyer warned, "If you've got it in the bottle and the lid's sealed tightly, it builds up pressure in the bottle."