January 19, 2012

As an addition to Brittas Light Blog-Post, I want to share with you what I researched.

This Blog is about Photoperiodism, an phenomenon which we can use to influence our Plants if we want to. But there exist many other means to influence Plants like Temperature, Color of the Light,  intesity of Light, Nutritions, Ph,…

Photoperiodism is about the length of the light and dark period in 24h.  With the length of uninterrupted darkness as a critical Part.

Short-day Plants (SD) need fewer than a certain number of hours of light in 24 hours to maintain or induce a special effect.

Long-day Plants (LD) need more than a certain number of hours of Light.

Intermediate-day Plants (ID) need more than … hours of light but less then … .

Day-neutral Plants (DN) are indifferent to the length of light for the effect you want.

Temperature can influence a Plants category. And some Plants need short days for a time before they become Long-day Plants (and the other way Round). Some need their special Light periode or they wont flower (or somthing)(absolute Effect) and some just benefit from their Light period and flower more (quantitative/qualitativ Effect).

We want to influence Flowering

For that effect I have found some Tables of Plants and their categories:

If nothing noteted behind they are probably absolute (or not) but it definitly has an effect. The Latin names are from the Book and the explanation is from wikipedia and can be falsly interpreted by me.

Short-day Plants

Allium cepa (lT<8° for sev. weeks otherwise DN, q?) – Onion – ger: Zwiebel

Amarantus caudatus/graecizans (q?) – Grain alternative, vegetable
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