If you're a professional landscape designer, you should be a member of APLD -- the Association of Professional Landscape Designers. If you join the organization by April 1st, you'll get three months of free membership. And if you become a "certified" designer (a peer-review process), you'll have an edge over other designers who do not. Clients will also appreciate the fact that you're a member of professional organization.
If you go to an APLD annual conference, you'll meet other pros from across the country, all of whom are willing to share advice, tips, techniques, and much more. Local chapters also offer workshops to further your education and local meetings where you can meet other designers in your area. Great people ... great fount of knowledge, and great fun. One other thing: don't forget to sign up for a free digital subscription to APLD's quarterly, The Designer. Free to anyone.
I've been a member for almost 10 years, and the decision to join is one I'll never regret.
Check out the video here of what some of our members are saying about membership in APLD.
Jane Berger, FAPLD