After a successful order, please make an Import Permit according to your country. Here is a link that can help you easily get your Permit. Making an Import Permit is only needed once, and you can order with the same Permit for the next.
US for any number plants:
Import Permit: https://www.aphis.usda.gov/aphis/resources/sa_epermits/sa_plants/ppq-epermits
Green Labels : https://www.aphis.usda.gov/aphis/ourfocus/planthealth/import-information/permits/plants-and-plant-products-permits/plants-plantproducts-shipping-labels
Canada for any number plants:
https://www.trade.gov/country-commercial-guides/canada-import-requirements-and-documentation
UK and other EU Countries:
https://www.daera-ni.gov.uk/articles/import-and-export-plants
https://www.gov.uk/guidance/import-of-products-animals-food-and-feed-system
https://business.gov.nl/regulation/phytosanitary-inspections/