For one of the largest selections of plants, flowers and gardening supplies- check out Molbak's in downtown Woodinville. The staff is extremely knowledgeable and eager to assist with all of your needs. The selection is massive and easily categorized under care requirements, to allow easy navigation through the aisles. There are also garden tools and accessories inside the store. I have found them to be slightly more expensive than discount retailers, but the service more than makes up for it!
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