Separate order cannot be combine. Each order will have an individual flat rate shipping fee. So, please combine your purchase to one list to avoid additional shipping fees. 

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We sell and ship items within the United States only via USPS.

Dahlia tubers ship each year in April and May via USPS. However, if you request using your order number a earlier ship date we will do our best effort to accommodate your delivery need. However, there are no guarantees.