"I haven't been getting close to them." Which was less because he didn't trust the flowers, and more that he wasn't trying to get pricked and tangled into the vines.

So to figure out just what Ginko means he leans right over into one of the roses and takes a deep breath. They smell normal, not any different than the roses in Bob's garden... but he recoils back and blinks rapidly as a wave of dizziness rushes over him. "Uh... whoa."