Answer: To order seeds you might start with Burpee (www.burpee.com or 800-888-1447). Many seed companies advertise in gardening magazines at this time of year, so that would be a good way to find out about more of them -- don't forget to check the classifieds.
To locate nearby dried flower wholesalers you might contact your UMASS County Extension to see if they know of any local growers. Alternatively your Chamber of Commerce might be a good resource to try. Good luck with your search!
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