Dear Heloise: I have a lot of houseplants, and it takes me some time to get to them all. Many are in our sunroom, and others are in the den. I use your two-minute plan; I can get a lot of plants watered in that time. Then I might take a break or go for “Soybots: Mobile Micro-Gardens is a responsive robotic-botanic hybrid artwork that utilizes light sensors to track sunlight intensity or to