American Institute of Floral Designers (AIFD)
A nonprofit organization dedicated to promoting the art of floral design as a professional career through educational programs and symposiums.
http://www.aifd.org/

Boerma Instituut
Professional floral design training.
http://www.dutchfloraldesign.com

Canadian Academy of Floral Art
The official newsletter of CAFA.
http://www.cafachat.com

Constance Spry
Floral design courses from one day demonstrations to a diploma program.
http://www.constancespry.com

Creative Floral Design School Of New Orleans
Featuring an 80-hour course to prepare students for a career in the floral industry.
http://www.floral-designschool.com

David-Curtis School of Floral Design
State-certified floral design school. Site offers pictures from classes, course catalog, entrance requirements, home study course, and more.
http://www.david-curtis-school.com

Floral Art School of Australia
Offers day, evening and correspondence floristry diploma courses.
http://www.floral-art-school.com.au/

Floral Design Institute
Offers basic through advanced programs, focusing both on business and design.
Category: Schools > Floral Design
http://www.floraldesigninstitute.com

Floral Design School USA
They offer online correspondence courses to earn a diploma in floral design, floristry, and flower arranging.
http://www.floral-design-school-usa.com

Floral Design Supplies
This way, it would be easier to continue practicing at home when class was finished.
http://www.floraldesignsupplies.com/

Flower Design of Britain
Floristry and flower arrangement school. Offers courses for professionals and hobbyists.
http://www.fdb-flower.com

Hong Kong Academy of Flower Arrangement
Offers flower arrangement certification courses.
http://www.hkafa.com.hk/

Houston School of Floral Design
They offer classes in floral arranging, wedding designs, silk flowers, shop management, and more.
http://www.floristschool.com

International Floral Design School
They offer floral design correspondence courses.
http://www.internationalfloraldesignschool.com

Out of the Bloom
Flower arrangement school in Camden with celebrity florist Joanna. Teaches design techniques for all floral occasions.
http://www.outofthebloom.com

Palmer School of Floral Design
They offer a certification program providing a thorough overview of floral design techniques, arrangement creations for all occasions, and exposure to industry practices and events.
http://www.palmerschooloffloraldesign.com

Phil Rulloda School of Floral Design
California state licensed school offering basic, advanced, wedding, silk, and tropical flower training and shop management courses.
http://www.philrulloda.com

Rittners School of Floral Design
Advice for brides and other wedding planners on how to choose a wedding consultant and florist.
http://www.floralschool.com

South Florida School of Floral Design
Thry offer training in aspects of the retail flower industry.
http://www.floralinstruction.com

Third Rock Design Studios 
DVDs teaching floristry and floristry toolkits. Targeted toward students,enthusiasts, professionals needing skills update and for use as a teaching aid/resource for tutors.
http://www.thirdrockdesign.co.uk/

Vermont Academy of Floral Design
Specializing in the art of natural floral design, offering from basic to advanced programs.
http://www.vafd.com