This is Mahonia aquifolium, also called Oregon holly grape.  It's not a holly, but the leaves look a lot like holly;   and it's not a true grape either; it's in the Barberry family.  It grows 2-5 feet tall, and is a nice border plant, or specimen plant.  This one is about 4 feet tall, and stands alone. It is beautiful.  

 

I've had my eye on this bush in Meeks Park for years.  It's near the bridge by the Tate Mill Wheel.  We notice it every time we walk in the park, because it is striking at every season.  Right now it has set next year's flower buds.  See the spiky buds?  They will open in early spring with clusters of bright yellow flowers, and in summer those flowers turn into bluish, black grapelike fruits.  You can't help but notice it then!!!

 

Last year the flowers opened early in March, then we had some freezing weather.  We saw that most of the flowers got frostbite, so there weren't many blue fruits on it last summer.

 

Everything I've read says the fruits are edible.  I've never tasted them, but I'll get back to you whenever I do.

 

HAPPY HOLIDAYS!!!