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Byron Sonne, seen during a court appearance in Toronto in 2011. ((CBC) )

The defence in the case of a G20 activist has agreed to allow the Crown to enter new evidence even though the judge had reserved her decision.

The new evidence relates to 1.7 kilograms of the chemical potassium chlorate, which police dug up out of Byron Sonne's former backyard last week.

Sonne's lawyer says the new evidence actually corroborates his client's defence.

As a result, he says, rather than spend time fighting the Crown and cross-examining witnesses, he told the judge he wants her to have the evidence related to the find.

The Crown says the way Sonne stored the chemical under a camouflage net in the yard suggests a "nefarious" purpose.

Sonne is charged with possessing explosives and counselling mischief before the G20 summit, although police never found any bombs.