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They currently have seed mats on sale. The three types are wildflower, butterfly garden, and giant pumpkin. See mats are 17 inches wide and 5 feet long. I bought the butterfly garden mat for $1.75 each. That is about the price of one packet of seed.
The seed mats are listed under What's on Sale/miscellaneous.This the description of the butterfly garden mat that I purchased.
Attract multitudes of butterflies with this colorful blend of cornflowers, cosmos, coreopsis, black-eyed Susan, zinnia and more. Contains both annuals and perennials for quick and long lasting color in summer. 17 x 5 long.