How To Force Bulbs To Bloom In Winter

  • How To Force Bulbs Into Bloom In Winter

Enjoy an early spring by forcing plants to flower indoors during winter. 

Grown in pots and put outside, bulbs will flower at the same time as they would if they were growing in a garden bed or border. But you can make them bloom earlier and cheer the midwinter gloom. 

GROW TIP When planting several bulbs in one pot, position them close together but make sure they’re not touching.

Plants you can force to bloom out of season 

Tulips, hyacinths, crocuses, freesias, snowdrops, jonquils and daffodils can all be forced to bloom out of season. 
 

tulip bulb bloom out of season, handyman magazine,
Tulips. Image: Thinkstock 
 

freesia,
Freesia 

 

hyacinth
Hyacinth

 

crocus, handyman magazine,
Crocus

 

daffodil, handyman magazine,
Daffodil

 

jonquil, handyman magazine,
Jonquil 


 

Create a display 

Choose early flowering varieties and plant them in autumn. 

The bulbs should start flowering 12-15 weeks after planting, depending on the type. Hyacinths and narcissi take about 12 weeks, and others a little longer. 

For a continuous show of blooms throughout winter, plant up pots at 2-3 week intervals.

Plant in pots 

Use a specialised bulb potting mix to grow them in pots indoors. 

SPREAD a generous layer of damp potting mix in a pot. Add the bulbs, fill around with mix so the tips just show, then firmly press down the mix.

COVER the pot with a black plastic bag and position it where the temperature will stay cool such as a shed, cold frame or garage. 

CHECK how the shoots are developing and that the mix doesn’t dry out. 

BRING them inside when the shoots reach 25-50mm and keep in a cool place out of direct sunlight until the shoots turn green, then move to a lighter spot. 

MOVE to the flowering position when the buds show, preferably a bright area where the temperature doesn’t exceed 20°C. 

WATER as needed and feed weekly with a high-potash indoor plant fertiliser.    

GROW TIP To support the flowers as they open, insert thin canes around the edge of the pot. 

plant bulbs in pots, handyman magazine,
Use a specialised bulb potting mix to grow them in pots indoors

 

What to do when plants finish flowering 

Deadhead when the blooms start to fade but leave the stalks intact. Move to a cold frame, continuing to water and feed with a high-potash fertiliser until the leaves yellow. 

Forced bulbs shouldn’t be used a second year as house plants. Store them in a cool, dark place over summer and plant them in the garden in autumn. 

While most bulbs will flower outside in the first spring after they have been replanted, don’t expect a spectacular display. 

flowering bulb, handyman magazine,
Deadhead when the blooms start to fade but leave the stalks intact

How to choose bulbs 

When choosing bulbs, select only those that are heavy and firm. If the bulb feels light, then it could be dead inside. If it’s soft, it may have a fungal disease. 

Tulip bulbs, in particular, need an intact outer skin to prevent dehydration and damage. 
 

tulip bulb, handyman magazine
Tulip bulbs 

hyacinth bulb, handyman magazine,
Hyacinth bulb 

freesia bulb, handyman magazine,
Freesia bulb 

jonquil bulb, handyman magazine,
Jonquil bulb 


Daffodil bulb 

grape hyacinth bulb
Grape hyacinth bulb 

How to raise bulbs in water 

Grow a single bulb in a vase of water to create a long-lasting fragrant floral display for any room in your home. 

Step 1. Add pebbles

Add clean pebbles to a 150mm tall glass vase to about 50mm deep. Position the bulb on the top in the centre, then add more pebbles to cover just up to the tip of the bulb.

Step 2. Pour water

Pour in water to reach the base of the bulb so the roots grow in water but the bulb stays dry, to avoid rotting. Put the vase in a cool, dry place until roots form, then move to a sunny spot.

Step 3. Design it right

Avoid mixing bulb types in the same pot as they’ll flower at varying times, making the display look untidy.

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