Hedge planting advice please

Hello to all you fine knowledgable people!

I am planning to put in a 50% hawthorn/50% other native species hedge in the areas shown in the photos.
It's about 40m in total. The hedge will be coming in meter-long troughs, between 80-100cm in height and 3 years old.
I am a complete novice, so am going completely on the advice of those who know better. In terms of what is there, I am told that it would be possible to put the new hedge on the near side of the line of roses, this saving having to take them out but also adding a bit of variety. Does this sound viable? It would be shame to lose them but at the same time I am looking for a hedge for privacy (and benefit to wildlife) so the new planting is the most important.
As I say, it's not something I have great knowledge of, so any other tips/advice would be gratefully received.
I'm in the Aviemore area of the Highlands, and deer can also be an issue- would protection be needed, or would the hawthorn likely be thorny enough already to put them off?
Thanks in advance for any advice!

 

Can I ask why you're buying those [expensive] trough plants? It's a very pricey way of growing a hedge
It's also not the best time to plant potted hedging of any kind - even in Aviemore. Depending on what you're planting, even shortish spells of drier weather can make it harder because of watering. The existing planting will also take up a lot of moisture that's there.
If you wait a few months, it'll be bare root season, and you can buy whips which are easy to establish, and will quickly grow away readily due to the lower temps and more consistent rain. You can also plant more densely as it's less expensive.
A proper, prepped border is always worth doing too, and it would be a good idea to strip off the existing turf/grass that would be in between the rows. Less competition for everything. Sticking plants in - even tough ones, when the ground isn't well prepped is false economy, and it's easy to lose a lot of them very quickly.

Deer will have a go at most things, so yes - they'd need some protection until established.

 

Thanks for the reply fairy fairygirl. Yeah, I realise the troughs are a pricier way of doing it, but I'm looking at getting a decent sized hedge in a shorter period of time due to the plot opposite being for sale and a new house going to be built. The sooner that's blocked out the better. The area had lovely trees and bushes but sadly they've all been cut down and removed, and at some point in the who-knows-how-distant-future I'm going to be looking onto a building site instead. There's also an issue with getting the actual work done with a window of opportunity coming up in a few weeks. I'm pretty much taking the chance while I can, even if it isn't ideal.
Looks like I should add in some deer protection then- any tips for this?
Watering is a concern, though the way this summer has been, maybe not!

 

The main difficulty is getting them established well over the coming months, even with lots of rain, assuming you get the sort of rainfall the east side had last year. We don't really have to worry on this side, but even so, with other planting nearby, it means those new plants can dry out quite easily. Thorough soaking when planting - before and after [bucket loads] and a mulch on top of bark or similar to help retain it and that will also benefit the soil. You can also water the ground first, but you'd need to assess all that when prepping the area.
Don't skimp on that border prep whatever you do. If you can get hold of well rotted manure, that's a great addition to a new border for planting anything, but any organic matter will be good - compost etc

There are specific tree/whip protectors available. This kind of thing - but they're very expensive
Welded Wire Mesh Tree Guards | 1.8m x 12" (300mm dia.) | Deer Protection

I expect you can get them much cheaper by looking around. There's probably a fair amount of suppliers in the local area as deer are very much a constant part of the Cairngorm landscape! They need to be tall enough as they can reach a fair height.

 

I will look into some sort of deer protection and add it in to the job- they're not a huge problem at the front of the property but they are around. And they definitely prefer to munch on things I've purchased rather than what is growing wild!
Thanks again for all your advice- very much appreciated.

 

If the existing roses are rugosa varieties, I can’t enlarge the photos enough to tell, then chopping them down by two thirds this Autumn would encourage lots of thick new growth next year. You would very quickly get a thick hedge again.

It’s hard to tell from the photos how much room there is but a native hedge will need space to establish, especially trough grown rather than slim whips, so I don’t see how you could keep the roses as well.

 

Thanks for the reply. Yes, they are rugosa. The plan was to plant the hawthorn this side of what is already there, the theory being it would have space and expand between and above the rugosa.
As I say, I am pretty clueless about such things, so it's not my theory! But I did think it worth seeking 2nd/3rd/4th opinions.

 

They will just grow into each other -it's common round here for stock hedging [ie hawthorn] to have these rugosa/dog roses growing through them.
The main thing is to initially have that gap between the two for the new hedging to thrive, hence my earlier comment about leaving a space and stripping the turf away. It's all the grass, weeds etc as well, that will all be competition for the new stuff.

 

Thanks fairygirl, I will heed that advice.