That's the way to go. I basically do the same with my friends when I visit their homes, or whenever I see them at a later date, I'll ask how the plant is faring. I have one friend that I kept wondering why her plants looked stressed from lack of water. Whenever I'd mention it to her, she'd always say "they don't need more water, I just watered them". One day her husband couldn't stop laughing after watching me inspect her plants. He must have seen the puzzled look on my face, so after he finished
, he finally admitted that he has to remind his wife that Deborah (your plant inspector friend) is coming and your plants are leaning. Then she runs around dumping water on them shortly before I arrive. So yes she can say, "they don't need more water", as she just watered them. Mystery solved. That friend doesn't get any of my special plants.