Hi Barry -
To me, this is worse than acting like you have a patent on the plant. At least if you had a patent, you would get the plant out to others! A 'No Grow' clause? Absurd! I agree with Bugweed...get the plants and throw caution to the wind. The growing and SHARING of plants is what drew me into the wonderful world of CPs. Don't lose sight of this just because someone thinks they can tell you what to do with a plant that you have paid for.
Go for it! Then share all you get with me! LOL