terrariums care pricing faq order press blog care instructions place your terrarium within 10 feet of a window without exposing it to more than 1 hour of direct sunlight a day. be careful of placing directly in south facing windows. in offices, fluorescent lighting should provide the proper color range for good plant growth, but can be supplemented with a desk lamp if necessary. the key is to watch your terrarium closely until you understand it’s drying pattern. Feel the soil about an inch or so near a plant, if the soil is damp, it isn’t time to water yet. too much watering can be worse for the plants than too little. 1 preserved moss this reindeer moss does not need care. however, if you are going to be away or the season is particularly dry, you can use it as a sponge to introduce moisture into your terrarium environment 2 cactus using the pipet that came with the terrarium, water a small amount around the base every 3 weeks, every 2 weeks in the dryer months. check often to see if plant is showing signs of stress: changing colors, shriveling, changing shape. then replenish fertilizer every 6 months with a few granules of a dried cactus / succulent fertilizer 3 succulent the same general care instructions apply to the succulents as the cactus above, although they may need a to be watered a bit more often, say once every 2 weeks, more in the dryer months. 4 tillandsias / air plants once every week remove tillandsia from terrarium, immerse the whole plant in tepid water, let the plant dry out for an hour before placing tillandsia back inside the terrarium. tillandsias need to dry out completely between waterings. in extremely dry conditions, or in the house or office with air conditioning or heating going, your plant may require more water. if your plant looks dry (check in the leaf sheaths, and the base of the plant) you could water more often as needed, as long as the plant dries out before being watered again 5 don't get wet! 6 don't get wet!