Hello! My satsuma trees have had a cold condition in winter - in my tranch greenhouse. It started to grow 10 days ago but there was no blooming in my satsuma trees. Only vegetative sprouts. What is the reason?

Because of the cold during the winter there could be two things that happened:

1 The tree formed flowers buds but they got frozen
2 The tree is not willing yet to make any flower so be patient

Good Luck!

Daniel, my tree haven't got frozen. All buds are OK and grows. I think it might be caused by a lot vegetation in the fall.

Neither an apple tree doesn't get frozen but still if the chill period is not ok then you might not have developed flower buds

Citrus don't start differentiating vegetative buds into flower buds until the very beginning of the flush. - Millet ( Divine Mercy Sunday)

So they react to the dry soil and produce flowers but not like the fruit trees ?

Don't they require a cold period of time ?

Danero, your correct. Citrus do react to cool or dry climates. Still flower differentiation begins with the flush. - Millet (Divine Mercy Sunday)

I got confused now , you mean that a citrus tree will decide all by himself if a bud will produce flower or just leaves or it is depending on a specific change in weather ?

Like a mind of it's own

Satsumas like other mandarins tend to be alternate bearing. Some years they will produce many many fruit and other years few or no blossoms and fruit.

Well, I don't know about a citrus tree making decisions, but certainly cold and drought encourage flower differentiating. The amount (duration) of drought or cold also makes a difference on what the tree will do. Normally 600 hours of cold temperatures is enough to set a crop. However, if the tree had set a heavy crop of fruit the previous year, around 800 hours of cold will helps in setting the current year's crop. For citrus, the differentiation to flower buds starts early in the winter and continues uninterrupted toward spring, but according to research by Prof. A. H. Kresdorn Univ. of Florida, the actual differentiation (actual change) occurs at the beginning of the flush. You can find his work on the Internet. He determined the time of differentiation through bud splicing and viewing the change under a microscope. - Millet (Divine Mercy Sunday)

Ok good to know , but what about the types that flower all year arround?

Is there any rule regarding to how many hoursyou can keep your tree on the dry side?

Thanks

I am not sure about drought and hours. Perhaps the determining factor is the percentage of tree wilt. If you are interested, below is a link about bud slicing to determine differentiation timing. - Millet (Divine Mercy Sunday)

Thanks a lot Millet! This information is very uselful for me. But i don't know what to do in my case? How to provide a good condition for my satsuma citrus?
P.S. I could not see the link about bud slicing to determine differentiation timing. Can you provide me this link?

I can not see neither any link below

OK I cannot get the link to work. However the sentence below is a sentence taken from the link. When I copy the entire sentence into GOOGLE search the link comes up, at least on my computer. It is the 4th link down, titled: "PDF] CITRUS FRUIT BUDS AND SOME FACTORS INFLUENCING THEIR DIFFERENTIATION. Anyway it works for me when I copy the sentence. Lazz is excellent with computers perhaps he can get the actual link to work. - Millet (624-)

Blossom-bud differentiation in the species of Citrus studied takes place at the initiation of growth in the spring

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