I had read about this place on happycow, and have eaten here numerous times. Was just here again for lunch, Jan 2014. Here's my Happy Veggie Garden review update.
This pure vegetarian restaurant opened back in the summer of 2006 and has since established a regular following. The original chef and some staff came from the long-time operating Happy Family Veg Restaurant that's also located in Rowland Heights, though ownership seemed to have changed again in 2013.
My family and I like to come here for the bargain lunch specials where each entree costs between $5-7 and includes a main dish, rice or fried bread, soup, and hot tea (weekday only). The food is made-to-order and served hot. Lots of flavors and lots of choices including mockmeats, tofu, and veggies.
It gets really busy and noisy on weekends so come early around 11am if possible. Weekdays are no problem, and the service is quick and courteous.
Dinner menu is also extensive, prices moderate between $8-14 per main entree.
I recommend: Tofu and basil in hot pot, Buddha's feast (stir fry veggies), steamed dumplings, crispy fish with sesame (don't worry, it's mock fish), and sweet & sour taro ribs.
The only complaints I have is that the food is typically very saucy (too much for me) and often contains sugar and salt, so I would suggest ordering some light vegetable dishes to balance out the meal.
Cons: lots of salt, and oil