How can I read the canister on the hill?

Hint 1 of 5:

Did you go in the greenhouse yet?

Hint 2 of 5:

Then you should have talked to the pukoid.

Hint 3 of 5:

He told you there was a secret path somewhere in the area.

Hint 4 of 5:

Try going to the left of the outside screen on the left.