Autumn is the best season for putting in new plants and trees, and the Northwest Horticultural Society will have its Plant Sale on Friday and Saturday, September 12 and 13. Take a look at the huge list of vendors and come during the sale hours of 11 AM to 5 PM on Friday, and 10 to 2 on Saturday. The sale will be at North Seattle Community College, 9600 College Way N. Look for the sidewalk sandwich boards which will direct you to the Plant Sale in the Arts & Sciences Garage.