Beginner Air Plant Terrarium Diy . I have added a couple of air plants, a string of pearls, and i just planted my first terrarium. To get started, use the big spoon to scoop the aquarium sand into the container. 4 DIY Terrarium Tips for Beginners 46 & Spruce Wholesale Supply House from www.46spruce.com Use a long spoon or your fingers to dig a planting hole for each plant. Make sure that your terrarium container has provisions for airflow because it is a plant terrarium. How to make an air plant terrarium: