if she's not interested, it wouldn't help sending the whole
Botanical Garden over.
Just chill. You are asking her a serious question and she's not
ready to answer it. In fact, I think you've left her no choice
because she'll think that calling you will give you the "wrong"
impression, even if she enjoyed your company on your date.
Besides, you do sound kind of scary. Continue with your own life.
If she's interested, you'll get an SMS.