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Q: How many hours of darkness does a plant need in order to bloom?
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Is grass a short day plant or a long day plant?

Plants that require more than six hours of sun per day, which is also referred to as day length and a short day plant is a plant that needs long periods of darkness before it can bloom


How does critical night length control photoperiodism?

Photoperiodism is the response of the plant to daylight and darkness. For short day plants it will bloom in darkness and when darkness exceeds critical night length, for long day plants it will bloom during daylight and when darkness is less than the critical night length.


Do you have to give your poinsetta plant light?

your poinsettia can take normal light a eastern window works well. to get them to bloom again for Christmas they need 12 hours of light 12 hours of complete darkness starting in October.


Plant sellers can cause plants to bloom on schedule by influencing the length of the?

daylight hours - its called photoperiodism


What is plants that flower when nights are short?

Poinsettias and chrysanthemums are short day plants. They need a certain number of hours of uninterrupted darkness to cause the plant to start flowering. Poinsettias need 18 hours of darkness to trigger this. Chrysanthemums need twelve hours of darkness.


How come you have had a marijuana plant for four months and it hasn't budded?

In order for marijuana to bud you would have to change the amount of light your plant gets throughout the day. You have to allow the plant to be in complete darkness for 12 hours out of the day, so 12 hours light / 12 hours dark. if the plant is getting 24 hours of light it is just going to keep growing. so change the light cycle and you will have buds.


What will happen if you try to grow a plant in complete darkness?

A plant can not grow in complete darkness because it needs light in order to produce chlorophyll. [cl-or-a-fill] Chlorophyll is the green in plants.


Why is it a bad idea to put African Violets in the dark?

The center of the plant (crown) is where the new growth appears, if plant is in darkness it will cease to produce more leaves and they won't bloom. Also, plant will eventually have a faded color verses green and vibrant.


What factor controls photoperiodism in flowering plants?

Photoperiodism is a mechanism that plants and animals have that reacts to the length of the night and day. It influences flowering because certain types of flowers will only bloom after long periods of darkness, while others can flower during shorter night time periods. Photoperiodism allows the plant to know what time it should flower.


How do you turn a pointsetta red?

Keep the plant in total darkness for 12 hours and in light for 12 hours and continue this process for 6 to 8 weeks.


When you want to induce budding on a weed plant whats the best way?

12 hours complete darkness,12 hours light....thats about it really


What is bloom?

bloom is used to many things but the most commonly known meaning of bloom is "the flower of a plant"