"It's less expensive to use milkweed to collect the oil that was spilled in nature because you have more capacity, you need less absorbent, therefore there is less of a cost of disposal," said Simard. Parks Canada is interested in the milkweed spill kits because they fit with its mandate for environmental stewardship, says Mikailou Sy, who is head of environmental management for Parks Canada. The contract is worth $186,651 and will supply 50 national parks