How I grow Trillium in Denmark

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Pedicellate typer/Pedicellate types

Sessile typer/Sessile types

My experience with Trillium in Denmark

Trillium grandiflora flora plena I live in the northwestern area of Denmark, only 15 kilometres from the
North Sea and in an area where we are getting plenty of rain during the
winter and having temperatures in winter nights around 0 C. +5 to – 6,
occasional down to – 10 C . I have grown several of the northern
American Trillium species, like T. grandiflorum and T. erectum, for
many years, with no problems.

Trillium decipens A few years ago I got my first Southern species, as far as I
remember, it was T. decipiens, a species which is quite rare
here in Denmark and therefore I wanted to give it the best
place in my garden, on a south-facing terrace, in shade
below a Rhododendron. The soil was peat with plenty of
humus and it grew well, but in late spring the weather were
very warm and every day when I was coming home from
work, the leafs of my T. decipiens were hanging down and I
could see it was not the best place for my rare Trillium.

Later the same year I made a new bed in an area, where
I used to have a well drained rock garden. I removed
about 30 cm. of the soil and topped it with a 30 cm mix of
peat and humus instead; I didn’t move the big stones
from the bed and below the peat mix, there still were a
very good drainage.

In same area grows a big Metasequoia glyptostroboides
and it gives a very useful shadow, here I planted my
T. decipiens and the following spring I didn’t have any
problems with the heat.

Later I have been able to get other southern species as
T. discolor, T. gracile, T. ludovicianum and
T. foetidissimum and they all grow well in the same bed.

Every autumn/winter I protect the plants with a handful of
pine needles and a little plastic covering, it will protect the
plants during cold nights in spring and the plastic will
protect for all the rain we get during the winter.

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