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For about ten (10) weeks after a start date anytime between September 20 and October 20 poinsettias (Euphorbia pulcherrima) need artificial darkness.
Specifically, that start date is the time at which poinsettias naturally initiate the process that culminates in the plant's late December bloom. In order for the process to start, poinsettias need no less than 12 hours 20 minutes of darkness on a daily basis during the above-mentioned time period. But in actuality the flowering process is jump-started anytime during the year in which the previously listed conditions are met. It therefore is possible to see the dainty, inconspicuous yellow flowers and the brightly colored modified leaves at times other than the end of the year.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoPoinsettias require strict light/dark control to trigger the colouring of the bracts.
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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.
When do red poinsettias bloom?
Red Poinsettias bloom in the cool, dark times of the year, when nights are long. Poinsettias require darkness and dryness to grow, as sunlight and excess water can damage the plants.
How much darkness do poinsettias need?
Twelve (12) hours 20 minutes of uninterrupted darkness for five (5) days straight is the amount of darkness that poinsettias (Euphorbia pulcherrima) needs in order to bloom.Specifically, that is the requirement that must be met sometime between September 20 and October 20 in order for poinsettias to bloom in December. Such is the natural bloom cycle for poinsettias as long as other critical conditions such as air and soil moisture, light intensity, nutrition and temperature are met. But in fact, anytime that poinsettias undergo the above-mentioned short day/long night cycle they have the potential to see the flowering process initiated and their modified leaves change in color from green to red 65-85 days later.
How much sunlight do poinsettias need each day?
there are over 2000 species so unless the variety in known, it is difficult to answer the question. They are adapted to a wide range of habitats, generally, well drained light soil in full sun, moist humus rich soil in light dappled shade or permanently moist soil in full sun
How do you use poinsettias in a sentence?
Thank you for watering my poinsettias.
Does poinsettia plants have a long root?
Poinsettias have fibrous roots that can spread as far as they need to.
Need 11 letter word that is a Christmas flowers?
An eleven letter word for a Christmas flowers is poinsettias.
Are poinsettias endangered?
No
How does photo period effect the flowering of poinsettias?
Poinsettias are short day plants and consequently are triggered to bloom by decreasing hours of daylight. Poinsettia growers follow a careful schedule of decreasing light in order to get them to bloom for Christmas. Most poinsettia growers use only artificial light so that light outside the greenhouse won't interrupt the flowering.
Need a sentence with the word darkness?
The wolf stared at me from out of the darkness.
In what type of container are poinsettias typically grown?
Clay or plastic containers that allow for good drainageare the types of pots in which poinsettias (Euphorbia pulcherrima) typically are grown.Specifically, poinsettias do not like conditions that support either drying out or water-logging of roots and soils. They therefore need soil that is high in aeration, drainage, moisture and nutrition. On the one hand, they need soil that retains moisture. On the other hand, they need soil to have good drainage and not pool moisture. So moisture must have a way out at the bottom of the pot. Saucers nevertheless must be emptied regularly. Standing water encourages root and stem problems in poinsettias.
Why do poinsettias bloom in December?
Because the month falls within the range of 65-85 days after the initiation of the flowering process December is the time when poinsettias (Euphorbia pulcherrima) can be expected to bloom.Specifically, bloom time results from the interaction of a plant's internal biochemistry with set environmental conditions. In the case of poinsettias, the natural timing of that initiation falls in September and October. But in fact, that flowering has the possibility of starting up in poinsettias any time the plant undergoes 12 hours 20 minutes of uninterrupted darkness for five (5) days straight ... if such other conditions as air and soil moisture, light intensity and temperature are met.
