Using a Terrarium to Start Tuberous Begonias

Terrariums are a popular trend in home décor, but did you know you can also use them to get a jump start on your garden? Terrariums can act as a countertop greenhouse for growing tuberous begonias. Spring is right around the corner, and this easy project is one you’ll be able to enjoy all summer long!

STEP 1:  PLANTING MATERIALS

 

Using a Terrarium to Start Tuberous Begonias - Longfield Gardens

Here is everything you’ll need to start tuberous begonias indoors.

• Moist growing mix

• Small  3-4″ diameter pots

• Terrarrium cover

• Dish for the base

 

STEP 2:  PLANTING

Using a Terrarium to Start Tuberous Begonias - Longfield Gardens

Fill about 2/3 of the pot with moist potting soil. Place one begonia tuber on the soil surface, with the hollow side up. Cover it with about 1/2″ of growing mix.

Place the terrarium lid over the potted begonia. Water sparingly until growth begins, the terrarium will act as a greenhouse, retaining warmth and moisture and helping the begonia grow. Place it in a warm location in your home, where there is plenty of natural light. Avoid south-facing windows, as temperatures inside the cover will get too hot.

Using a Terrarium to Start Tuberous Begonias - Longfield Gardens

Depending on the temperature of your home (best temps for starting begonias are 70-75°F), you will see sprouts in 2-4 weeks. This can vary, so be patient. Water only when the soil is dry to the touch.

When your begonia is about the size of the photo below, it is time to remove the terrarium cover. This may take 6-8 weeks.

STEP 3:  TRANSPLANT AND ENJOY!

Using a Terrarium to Start Tuberous Begonias - Longfield Gardens

Take the young plant out of the small pot and move it into a larger one, adding additional growing mix as needed. After transplanting, give your begonia a boost by watering it with an all purpose liquid fertilizer once a month. If you have multiple begonias to plant, you can plant them into separate pots or put them together in a larger container, keeping the tubers about  8″ apart.

After any danger of frost has passed, you can move your begonias outside. Choose a part shade location that doesn’t get any hot, midday sun. Morning or late afternoon sun is best. Water when the soil is dry to the touch and be sure to check more often during hot weather. Removing spent blooms and wilted leaves will help your begonia stay healthy and also encourage it to set more buds.

 Using a Terrarium to Start Tuberous Begonias - Longfield Gardens

 To see our complete selection of tuberous begonias, click HERE.

Learn more about growing begonias here: All About Begonias, How To Plant Tuberous Begonias: Which End is Up, and Tips for Growing Tuberous Begonias.