Agrium (AGU) F-10 Registration of securities (Canada)

Exhibit 5.2

March 23, 2012

Agrium Inc.

13131 Lake Fraser Drive S.E.

Calgary, AB T2J 7E8

Ladies and Gentlemen:

Re: Registration Statement on Form F-10

We hereby consent to the reference to us in the registration statement on Form F-10 to which this consent is attached (the “Registration Statement”) and the related short form prospectus (the “Prospectus”) of Agrium Inc. and to the use of our firm name under the headings “Enforceability of Civil Liabilities” and “Legal Matters” in the Prospectus included in the Registration Statement.

In giving this consent, we do not thereby admit that we come within the category of persons whose consent is required by the Securities Act of 1933 or the rules and regulations promulgated thereunder.

Yours truly,

/s/ Blake, Cassels & Graydon LLP

BLAKE, CASSELS & GRAYDON LLP