Dipladenia/Mandevilla pruning

Hello every one, is there anyone who can give me any advice on how to prune a Dipladenia splendens (used to be known as Mandevilla) please.
Mine is growing up an ornamental tripod about 4 ft high and is now starting to send out shoots everywhere (a little like wisteria does). Do I cut these back hard or just trim?

 

No idea personally but it seems quite straightforward according to the RHS page..................

https://www.rhs.org.uk/advice/profile?PID=713

 

Thanks Longk, that's helped a lot.

 

How do you keep yours RSM free? Mine was plagued with it.

 

I keep mine as an indoor plant. It's been growing happily away in my kitchen for 2 years now and I've never had any problems with it. Last year it flowered from may all the way until Christmas.

 

Lucky sod. I suffer from RSM outdoors since I moved here! I had to leave my BoP outdoors to take a couple of frosts before I bought it back indoors for the winter.

 

What's a BoP ???

 

I've tried Dipladenia on a couple of occasions but its never been long lived for me.

Kind of just fading away really, so actually pruning the thing has never been a problem for me.

 

These were the flowers at Christmas, on my kitchen windowsill. Then it went into a period of doing nothing but now it's sending up long thin shoots everywhere.

 

Yeah, same with mine that I bought last year. Was growing nicely with plenty of flowers, but it was soon apparent that something was affecting it. I suspected RSM as I couldn't see anything that was causing it. Chucked it out last month....

 

As it flowers on new wood, I think the key is to prune it after flowering, ie in late autumn or early spring.

In the past I have lost a couple of small plants that I tried to winter just frost free, but a minimum of 10C seems to work well, as mine are starting to wake up. I have a couple of small ones and a couple in my conservatory that are already up to the roof. My conservatory gets very humid and I have been lucky enough so far to have no problems with RSM.

I read about the different types, but I have no idea how anyone knows what they have got. They never seem to give any details when sold.

 

I'm surprised to be free of it indoors even though I am quite harsh on anything affected by it outdoors.

 

Bird of Paradise/Strelitzia reginae

 

Regarding RSM, I tend to think its one of those pests that once seen, never got rid of.
Until then, ........thank god

I have a couple if insecticides that are very effective but not available to us amateurs.

 

Touching wood I have kept this house free of the damned things, but their proliferation outdoors is puzzling. Frost is by far the most effective control. Followed up by two or three weeks in the cold shed to take care of the eggs.