Kubota Garden is Seattle's best kept secret and a great treasure. An amazing 20+ acre city park, this is a free japanese-american garden that you will want to visit again and again. The park has just undergone a tremendous renovation, and it is even more beautiful than before. It is always surprisingly uncrowded, even when the parking lot is full.
The garden foundation holds a semi-annual plant sale where you can buy donated japanese garden plants and such items as stone lanterns and basins at rock-bottom prices. The volunteers who staff the sale are very knowledgeable. Past sale proceeds have funded the lovely gate at the entrance to the garden, as well as the information station, and improved restrooms.
Come early, though the sale ends at noon, many people are waiting for the gates to open by 8am. Rare and desirable plants go fast.