If you're a US florist looking to source local flowers in your area, here's a helpful directory to check out. If you're a UK florist, check out this directory for local UK grown flowers. (Courtesy of BloomTrustCo.)
ONLINE Fresh Floral Wholeslers:
ONLINE dried and hard goods Wholesalers:
Here are some conditioning and care resources:
This video is about how to care for peonies and mistakes to avoid in handling them from an experienced flower farmer.
This link takes you to Mayesh Wholesale's Educational Guides. They include:
Reliable Products
Care and Handling of Flowers
And specific flower type guides including Garden Roses, Eucalyptus, Tropicals, Peonies, Preserved, and Garlands