$20  Gift Card for Sloat Garden Center

Sloat Garden Center is a premier garden center in Northern California. We offer a wide selection of fresh plants, high-quality garden tools, soils, pottery and garden expertise by our knowledgeable nursery professionals. Our mission: Great plants and great advice to help them grow!

http://www.sloatgardens.com/

Several Bay Area (and SF) locations:  http://www.sloatgardens.com/about-us/locations/