I believe that your past experience can truly come in handy for those hands-on projects! I think it would be great to incoporate your experience in the plant industry into the classes lessons. I would definitely incorporate science experiments into your daily lessons, if applicable. Most students fail to learn just by reading out of the textbook. For example, if you are teaching about plant growth, you could possibly show students how a plan grows from a seed by having the students plant a flower, fruit, or vegetable seed and watching it grow over time. I remember doing the bean that would sprout in a plastic baggy with a wet paper towel! We used to get so excited when our bean finally sprouted.
Another great option for doing hands on learning would be creating science centers in your classroom. This way you could set up different experiments that the children could do and rotate the children so everyone has an opportunity to do multiple experiments while working in small groups. Kids love working with their hands, so any use of play dough, slime, sand, or water is great for them!