you live in KY? I do. I usually keep 4 going, never 5. The answer, by the strict letter of the law is not you shouldn't get dinged for having just four HOWEVER - this will depend on the mood of said arresting officer. The case could be made to go ahead and weigh the plants wet with the soil - I've heard horror stories of this happening to folks where they say they had $10,000 worth of pot when it was probably more like $500-700. At any rate I'd say as long as you keep things on the down low you should be cool. I've been growing in KY for a long long time. Keep scales and extra baggies away from the grow area as this could lead to trafficking charges.
Also, people's opinions on the internet are never a substitute for proper legal advice. Contact a qualified JD if you want a fully legit answer on this topic. Best of luck man, and happy growing.