Indoor Bulb Experiments
Bulbs into Cold Storage
your refrigerator temperatures
You can experiment
with cold storage temperatures using any available refrigerator or cold
room. Refrigerators commonly operate between 34-44 F. Test yours by placing
thermometers in several different locations. If the temperature varies
significantly you may want to devise experiments with the results.
Pots of bulbs can be placed outside in colder climates (covered with various
types of insulation), then brought in after different periods of time.
During the cooling period, keep the soil moist but not wet. Keep the pots
cool and never allow them to freeze.
Bulbs Out of Cold Storage
Different bulbs require different amounts of cold before they will grow.
Think about your own gardens- the earliest bulbs are often wildflower
bulbs or domestic “Snowdrops" or crocus. As the spring season
advances, later bulbs emerge according to their own inner clocks.
most bulbs need between 12 and 16 weeks of cold to break
their dormancy, you might design your experiment to look at this phenomenon.
Generally, when the bulbs have sprouts of about 3 to 7 cm, the pots will
be ready to bring out into your warm classroom. Place them at room temperature
in a bright place for all to enjoy.
Growing Degree Days
- How much
heat does it take for your bulbs to grow and bloom? Try using the "Growing
Degree Day" lesson indoors.
GDD values for both your indoor bulbs and your Red Emperor tulips planted
outside. Which will require more heat?
Try Forcing Paperwhites:
Don't have a cold place to force bulbs?
to: Indoor Bulb Experiments- Part 1 >>