Clematis × triternata ‘Rubromarginata’

Sorry just asked a Q about this clem and then remember I forgot to ask how prone to powdery mildew it is? Thanks



Hello, It is not particularly susceptible – particularly if it is kept well fed and watered.



Can I keep this clem smaller by pruning off when it is getting too large in the summer? I have poor soil for clems but I read that this one will do well where others wont. However, I only really have space 6 foot high by 6 foot in either direction, so with careful guidance of the growth to the horizontal can I then lop bits off when it starts to go beyond the allotted space? I did read you can grow it over a garden arch so presumably it can be trained kept smaller can it? I realise that it does all this growing in 1 years (having been lopped down in Feb) but can it be contained within the parameters of the space thanks?



Hello, I’m afraid this does not sound ideal, as it produces its flowers on new wood, and if this is continuously being cut back, then you will be compromising the display.



Is a pot that is 50cm tall x 25cm x25cm big enough for this clematis? Alternatively, what about a pot that is 75cm tall x 32cm x 32cm? I don’t need it to grow more than about 2m tall x 1m wide.

Novice grower


The plant would probably be quite happy in the smaller pot for a couple of years (provided it is kept well fed and watered), but ultimately, the bigger pot would be a better option.



I planted up a pergola some years ago with various climbers in pots, non have done that well even though they were fed and the pergola never actually got covered. I have now had some of the stone cut back where the four uprights are and am about to plant into the ground, we have managed to get a hole which is approx 12″ x 8″ Two one litre pots fit in nicely side by side. We have clay soil but have added compost and some feed and have tried to mix the soil as far down as we can. Would you put two plants into this hole or just one? I was thinking of putting in some fast climbers both deciduous and evergreen with a mix of jasmines and clematis.



Hello, Growing any large plant in a pot will restrict its height, so if you want your climbers to get big enough to cover the pergola, then you will need to plant them in the ground. I would be careful not to overcrowd them however as effectively you will be restricting their root run again. With that in mind, I would plant one per hole.



Can you plant these clematis in a container?



Hello, provided the container is large enough, then yes you can, however a better option would be a more compact clematis – say one that will grow to around 2m in height.



I have planted several clematis this year and all doing well. Some are early flowerers and some late. They were planted with lots of compost. Should I feed them this season or wait till next spring?

Plant mad granny


Hello, It really depends on what you planted them with – and how long they have been in as different fertilisers release their nutrients at different rates. If however you have not used anything apart from some composted organic matter, and they have been in the ground for several weeks, then you could give them a feed of something like Vitax Q4.



I have had a couple of these plants for over 10 years and rate them very highly for the scent and coverage. I had to remove one due to building works and now the second one looks rather poorly. Last year it did not grow so vigorously and this year it looked a little healthier but has now gone brown and dead. Any thoughts on the cause? Also is it wise to try another to replace it?

Clem Maitlis


Hello, It is difficult to say what could be causing this from your description, however if it was near the building works, it may have been caused by changes in soil levels or some form of soil contamination from the building products. If you are confident that it is not the latter, then there would be no reason why you could not replace it.



Is this the same plant as Clematis Aromatica? This variety was on my Wish List but it has recently disappeared completely and this is the only one now listed that matches it in terms of appearance, scent etc.



Hello there Unfortunately we don’t sell Clematis ‘Aromatica’ now but Clematis × triternata ‘Rubromarginata’ is very similar with the lovely scented flowers, but could grow larger to 6m x 2m approx eventually. Hope this helps



Vigorous climbing plants Hi, I am looking for rapid growing climbers (evergreen and non-evergreen) that I can grow through trees without harming the host trees. The planting site is as follows:- -East facing but ultimately the aerial part of the growth will be facing west – Shaded at the base where the young plant will be started i.e.roots in shade but tip of young plant showing above adjacent hardstanding car park – Moist well draining soil Can you recommend some varieties? Many thanks, Roger

Roger Pirrie

2010-04-12 2010-04-12

Crocus Helpdesk

Clematis, Viticella Clematis, Late Small-flowered Clematis ‘Rubromarginata’




8-10 ft. (2.4-3 m)


36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)


USDA Zone 5a: to -28.8 °C (-20 °F)

USDA Zone 5b: to -26.1 °C (-15 °F)

USDA Zone 6a: to -23.3 °C (-10 °F)

USDA Zone 6b: to -20.5 °C (-5 °F)

USDA Zone 7a: to -17.7 °C (0 °F)

USDA Zone 7b: to -14.9 °C (5 °F)

USDA Zone 8a: to -12.2 °C (10 °F)

USDA Zone 8b: to -9.4 °C (15 °F)

USDA Zone 9a: to -6.6 °C (20 °F)

USDA Zone 9b: to -3.8 °C (25 °F)

Bloom Color:

Magenta (pink-purple)

Flower Fragrance:

Very Fragrant

Bloom Shape:



Bloom Diameter:

Small – less than 2 inches (5 cm)

Bloom Time:

Mid Summer

Sun Exposure:

Full Sun

Other details:

Unknown – Tell us


All parts of plant are poisonous if ingested

Handling plant may cause skin irritation or allergic reaction

Pruning Groups:

Group 3 – Summer/Fall bloomers; prune hard in early spring

Patent Information:


Propagation Methods:

From woody stem cuttings

From softwood cuttings

By serpentine layering

Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

Foliage Color:

Unknown – Tell us

Bloom Characteristics:

Unknown – Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Grow outdoors year-round in hardiness zone


This plant has been said to grow in the following regions:

Winnetka, Illinois

Louisville, Kentucky

Upton, Massachusetts

Salem, New Hampshire

Southold, New York

Portland, Oregon

Wilkes Barre, Pennsylvania

Tiverton, Rhode Island

Enumclaw, Washington

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