Parts of a plant: we did this in Playschool a few weeks ago with kids ages 1-5 and took our time talking about the various things a plant needs to grow as we added each one and then our labels. We added a label for the stem, one for the leaf, and the petals. For the flower petals we used cupcake liners, a great activity for kids especially preschool age that's interactive, educational, and fun! A great precursor to planting real flowers or plants in the classroom or home as we did yesterday!
Lemon! Once finished these lemons feel (to touch) remarkably like real lemons, which is cool! And also makes this a great sensory project for preschoolers: touch (texture), sight (vibrant yellow colors) and taste - because it is just wrong not to accompany this activity with either a wedge of lemon to explore or a small glass of lemonade!