PRUNING ADVICE
Links Within This Page:
Prune Group 1 | Prune
Group 2 | Prune Group
3 | Orphans | New
Plants | Summary
One of the things that worries people most about growing
clematis is the pruning. They can't remember what group their plant
should be in, or what to do with it so the constant cry is 'We want
one that we don't have to do anything with'. Well, folks - Bad News!
They all need some pruning to a greater or lesser extent, and paradoxically,
the ones that need most pruning are actually the easiest to deal with.
None of this should cause you a moments worry and I will now attempt
to clarify the mysteries associated with pruning and give you a rough
guide as to what you should do with orphans (clematis who have carelessly
mislaid their names).
PRUNE GROUP 1:
This applies to all the early flowering varieties - that is, anything
that flowers from January to May. This group includes armandii, cirrhosa,
alpina, macropetala and montana. If you don't want to prune them, you
don't have to, but they would benefit greatly from a tidy-up after they've
finished flowering. Cut out weak and dead growth, thinning out where
the plant is becoming overgrown and musty.
The alpina's and macropetalas tend to retain dead leaves from the previous
year, putting out new growth over the top, so this can make a plant
look unsightly as it gets older.
This is also the time to control montana's, curtailing their ambitious
plans for world domination. Cutting back into very old wood is not a
good idea as it can introduce disease and the shock can often kill the
plant, but taking out the whippy growth after flowering makes a big
difference. The growth these plants make throughout the summer is what
they flower on the following year, so if you prune these early flowering
plants in the autumn or the late winter you will have no flowers in
the spring. If any of these are wandering 30 ft up a tree, rather than
risking ladders, life and limb, I would leave well alone
PRUNE GROUP 2:
The plants that fall into this category are the large flowered hybrid
clematis that flower in May and June, and all the double flowered hybrids.
At the end of February to mid-March, depending on the weather ( use
common sense here ), trace back roughy 12 inches from the top of each
stem to two fat leaf buds and cut the dead growth away above these.
Some stems will be weak or diseased so cut these out entirely and on
some stems you will need to go back further before you find those leaf
nodes.
Bear in mind that you are working to create an attractive framework
for your plant and that these varieties, like the group 1 forms, flower
on growth they produced the previous year. However, because they flower
later than the group 1 varieties, hard pruning these doesn't mean that
they won't produce flowers at all, but what is produced will be later
and smaller, doubles will be single. Selecting one or two stems to hard
prune will encourage bushy growth from the base of the plant.
After pruning is completed, tie the remaining growth into shape, leaving
space for the flowers and not tying too tightly.
PRUNE GROUP 3:
Group three are the plants that flower later in the season on new growth
produced that year - the viticellas, jackmanii and late flowering hybrids,
texensis, herbaceous and other late flowering species. In late February
/ early March, depending on clement weather, trace each plant up from
the ground and cut back just above the first set of decent leaf nodes,
usually about 12 - 18 inches up.
You will notice later in the Spring that some of these varieties could
have been cut back to below the ground because the growth you left is
dead and new shoots have come up from below the ground. As the plant
grows, tie it in to the framework or encourage it to meander through
its host plant.
ORPHANS:
When taking over an established garden, or trying to identify a clematis
a little rhyme is worth remembering. "If it flowers before June, don't
prune". Northern gardeners could take the longest day as their 'cut
off' point ( no pun intended ). However, savagely pruning a large established
Jackmanii Superba for instance will probably kill the plant. The newest
viable buds will be considerably more than 18 inches above the soil
level, and there will be no more growth to come from under the ground.
Cut back to the lowest viable leaf nodes ( however high that may be
). The plant will be leggy - grow something else in front of it!
NEW PLANTS:
It's not a bad idea to hard prune all new clematis at the appropriate
time, regardless of their true category. It encourages a strong root
growth which is most important and also encourages new shoots to grow
from below the ground, making a bushier plant ( see Planting
Instructions ). Pinching the new growth out also encourages
bushy growth, especially on the large flowered hybrids. You sacrifice
a few flowers in the first couple of years, but ultimately will have
a better looking plant.
Many of the taller later flowering varieties tend to be leggy - pinching
out helps a bit but not much. Better to plant something to hide the
deficiency or grow them through another plant.
SUMMARY:
Look at your plants - they are practically telling you what to do. Early
= 1, Mid-season = 2, Late = 3. Easy. As you become more experienced
you will be able to experiment with pruning - this is just a basic guide.
If you don't do it right, it's not the end of the world. You just lose
flowers for that season - there are no Pruning Police ( thank goodness
).