I've always wondered about a few things that had to do with round-up or any Glyphosate based product and thought I would ask if anyone knew an answer. Here they are: 1. How long will round-up stay active if left in mixed form in a backpack sprayer? 2. I know that round-up only works if the plant is actively growing but someone once told me that it will stay active on the plant until it IS growing. Is this true? 3. What would happen to grass or shrubs if you mixed round-up at one ounce per gallon? Would it work like a PGR or would it kill it? 4. What will happen if you get round-up on only one or just a couple of leaves on a shrub? Will it kill it? I thought I had a couple more questions but I'm drawing a blank right now so if anyone else has any questions feel free to chime in.