The City of Edmonton does not recommend that the general public collect seeds from natural areas on their own regard for several reasons:
Wild areas containing prairie perennials, in particular, are no longer widespread and can be vulnerable to human impact
Without a lot of experience and knowledge, it can be difficult to accurately identify species, potentially leading to rare species being collected
Some places are protected areas or privately owned and you require permission to collect from there
It is best to purchase seeds, seedlings, or more mature plants from reputable suppliers who are experienced with wild harvesting.
Plants From the Wild
Aside from disrupting the ecosystem, many mature native plants do not survive transplanting. There are also some plant species that are endangered and it is illegal to remove them from the wild.