Posted by shw104 7 years ago In:

tree, gardening

shw104 Asked:

If an Oak Tree is growing in a greenhouse and never sees cold weather or a frost.. will it still lose it's leaves in the fall/winter?

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6 Answers

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Danny S Answered:

Theoretically the isn't suppose to drop its leaves. In the field, greenhouse trees usually die during autumn if the shelter is not lifted. The problems starts at a temperature lower than 28 F. The unprotected trees has gone into dormancy and are not affected by the cold, while the protected tree hasn't and freeze to death. Same goes for the high temperatures of the summer.

Posted 7 years ago

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shw104 Answered:

OK.. let me restart the question.. if an Oak Tree is planted in a greenhouse and receives temperate temperatures all year long (never below freezing).. will it still lose it's leaves in the Autumn?

Does the cold trigger the tree to go dormant or is it based on the time of the year? Can an Oak tree survive without going dormant in the winter?

Posted 7 years ago

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Danny S Answered:

I would like to correct myself- It will drop its leaves anyway, assuming that sunlight can go through. Trees fall their leaves according to the length of the day.

Posted 7 years ago
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shw104 Answered:

OK.. not really getting my question across.

Let's say a Tree is growing indoors under simulated outside conditions (light, water, etc). However, these conditions are held at summer conditions (temperature and length of day). If the tree receives no Fall/Winter cues, will it still lose it's leaves.

If the answer is no... will the tree survive multiple years without going into a winter dormant mode?

Posted 7 years ago

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asaraink Answered:

I would say that because each leaf already contains the pigments for all the colors, and the red and yellow, orange, only show because the green pigment dies, that the green pigment would only die of old age, or attack from a mite or something, so the tree might lose green leaves all the time, like Kukui nut trees in Hawaii. With no changes at all in lighting conditions, I think your oak would not bare fruit- no acorns :(