Winter life of orchids

Text and photos Rainar Kurbel, MTÜ Käoraamat
Translation Liis
It is a familiar fact that orchids in Estonia flower in spring and summer and then set seeds in the second half of summer or in autumn. But what happens in late autumn and early winter before the serious degrees of cold arrive? A total rest period? Actually no.
After setting seeds, the orchid plant in autumn slowly starts underground preparations for the new season. How far they advance with this depends on the weather, mainly the degrees of frost. It can be surmised that the warmer the climate in autumn and early winter, the further development advances, and the more probable the appearance of new orchid leaves above ground for winter. A softer climate is favoured primarily by warmth from the sea and so this is a phenomenon most often seen in Saaremaa and Hiiumaa. But even there not always and not everywhere. In mainland Estonia first of all on the coast close to the sea and even there only in some specimens. Elsewhere in Estonia it is already less likely.
Depending on the particular year.
In late autumn of one year in western Saaremaa  I have seen new leaves or shoots of 14 species as a maximum! Certain to behave so are the greenwinged orchid (Orchis morio) and burnt orchid (Orchis ustulata).
The winter leaf rosette of the greenwinged orchid is the largest (in the photo above up to 14 cm). November 25, Karala, Saaremaa
Quite often the early purple orchid (Orchis mascula) and the military orchid (Orchis militaris). Sometimes also species of the Dactylorhiza genus and the fly orchid (Ophrys insectifera). The latter was chosen by the EOKK as orchid of the year 2015.
Saaremaa marsh orchid, Dactylorhiza osiliensis, on november 25th, Atla, Saaremaa, (this new orchid species was formally identified as late as in 2005)
Fly orchid on November 25th, Kuusnõmme, Saaremaa
Less often the Platanthera or butterfly orchid genus and the fragrant orchid (Gymnadenia conopsea ). In very favourable years even the lady’s slipper and the helleborines manage to get their shoots to ground level or even a centimetre above it.
Lady’s slipper, November 25th, Kuusnõmme, Saaremaa
On the coast of mainland Estonia the burnt orchid certainly gets its new leaves to ground level.
Of the reminder primarily the early purple orchid can be seen, less often leaves of the military orchid. However, other species cannot be completely ruled out.
Leaf rosette of burnt orchid, December 28th, Hanila, Läänemaa
Leaves of early purple orchid, January 10th, Hanila, Läänemaa
When more severe winter arrives all development of course stops and the plants enter a state of dormancy.
The activities of MTÜ Käoraamat can be followed in Facebook: LINK




My Nature Calendar

Help to do Looduskalender.ee better - send Your observations about nature.