I mostly use trade nurseries but one or two also sell to retail customers as well, these are suppliers I have used and would recommend.
Royal Horticultural Society – Currently 4 gardens of their own and many partner gardens
http://www.gardenvisit.com/ – such a great resource for finding gardens near you, bit like Trip Advisor for gardens, but better!
National Garden Scheme NGS – The Yellow Book and now the website offer access to hundreds of private gardens opened for charity.
CONTINUOUS PROFESSIONAL DEVELOPMENT
http://www.my-garden-school.com/ – A really comprehensive online learning experience with a wide variety of great courses. I have reviewed several courses for them after taking the course myself.
Garden Museum – A great resource and some great speakers/courses.
Society of Garden Designers – CPD is run on a regular basis across a wide variety of topics.
NUTS & BOLTS OF THIS WEBSITE
WordPress –This is the free website/blogging software that I use, there are others but this is the one i have found to be most widely supported by an open source community. Bear in mind that you will still need to find a service to host you website
ICD SOFT – We host RGA with ICD soft. This is not the first hosting company I’ve worked with, but it is definitely the best so far. It’s incredibly easy to use with truly excellent, responsive customer service.
Easily – All of our domains come through Easily.
MailChimp – for email marketing