| . |
| What is the basis of this mechanism?' |
| This mechanism is the result of the lowering of freezing-point in the
living plant cells. The temperature, when freezing commences, gets lower the more anti
freeze matter is suspended in the water. This 'anti-freeze' for the plant consists out of
sugars and proteins and salts. The higher the level of these products in the moisture in
the plamt's cells, the less likely it will freeze. Winter hardy fuchsias have adapted their plant cells in such a
manner as to be able to hold higher levels of sugars and salts. That is why no ice
crystals are formed in the cell. This adjustment consists out of a membrane around each
cell, that allows only pure water to pass from the cell moisture. The pure water nestles
itself between the cells and freezes there. In the living cells remain only concentrated
levels of the anti freeze mixture of the sugars etc. over, and that does not freeze there
(refer 'Plant cells of sensitive to cold and winter hardy plants').
In non winter hardy fuchsias the
cell moisture freezes, as a result of the low percentage of the anti-freeze. As with a
wooden rain vat is pushed to pieces during thaw, this also happens to plant cells. Usually
the plant is irreparably damaged. The pure water between the cells of winter hardy plants
causes some expansion of the plant, which is still noticeable following defrost. In this
process only deformation of the plant cells occur, but this has no consequence to the
plant. |
| . |
| Are winter hardy fuchsias able to be classified in
classes of anti-freeze remaining in the plant? |
| According to the author of 'The Hardy Fuchsia guide' David Clark, is this
in England classified in five classes, designated by 1 to 5 asteriks: The list of hardy
fuchsias that were tested in France, is divided in four groups, according to the levels of
freezing expressed in °C and method [see the Dutch society paper 'Fuchsiana' febr. ' 97
pag.20 - 24]:
| 1e
list: Very winter hardy fuchsias |
| 2e
list: Good surviving fuchsias |
| 3e
list: Without doubt hardy fuchsias |
| 4e
list: Limited as to winter hardiness fuchsias |
The Dutch UTC-team 'Trials
to test fuchsias on their hardiness in winter' got the impression that fuchsias are
not capable of being classified according to level of remaining anti-freeze in the plant
and the survival changes according to the level of frost. |
| From where do winter hardy fuchsias derive their
hardiness, and why are the flowers of many these in the colour composition red-purple?
|
. |
| They
obtain their winter hardiness from the properties of specific botanical fuchsias
(species), that possess an adopted mechanism concerning resistence to frosts. The original sources of botanical fuchsias
that were used since the first crossings started in approximately 1820, are mostly not
known. It cannot be surprising that they are the very first derivatives who have the
properties of winter hardy. And have the colours red - purple. The answer is simple.
During those first hybrid growing's they used species that nature had already adopted to
the colder climates, for they came from high in the mountains. In one of the first French
books on fuchsias it is noted that many growers used for instance F.coccinea and F.gracilis
(magellanica). Also used at that time were the winter hardy types F.globosa
and F.procumbens. With the exception of F.procumbens all have red purple
flowers.
|
| Hardy
fuchsia species - Hardiness obtained from hardiness species, as F.regia (above)
and F.magellanica |
|