Raised bed tall tree/plants?

Edlonton

Hi

I have a raised bed and I would like to plant something quite tall, around 2-2.5 metres high to act as a privacy screen. 

I was thinking of black bamboos but every time I see some in planters they don’t look too dense or even very green (the leaves). 

What kind of tree/shrub would it work?  Ideally I need something that survives easily as the idea is to cover some overlooking building nearby. 

Thank you. 

Loxley

Yes bamboo can look a bit sickly if you can't keep on top of watering it. Is the planter sat on paving, or is it open to the ground at the bottom? How big is it, how much sun etc?

Fairygirl

As @Loxley says @Edlonton - the size of the bed, and what the growing medium is in it, etc are all important for suggesting ideas.  
If you can add some photos, that will really help. The icon that looks like hills is the one to use. If you can keep the photos on the smaller size, they upload better too  

Edlonton

Good point. 

It is 40 cm hight , around 70 cm wide and lengthwise it’s about 3 metres long. 

The soil will be on top of the current tiles, so a bit of draining into the ground. 

Hope it helps to figure out the potential options. 

Thank you. 

Loxley

If shady I would actually suggest Phyllostachys, they don't need the shade as such but it makes keeping on top of watering easier. They cope with periods of drought but tend to drop their leaves and look scruffy. An evergreen shrub like Eleagnus ebbingei might be a decent alternative, it's fairly easy to find large specimens of it for sale.

Fairygirl

I'd agree with that. Most Eleagnus are really easy to manage too. Very few problems.
Some of the evergreen Viburnums might suit as well, especially if it isn't really hot and sunny.  I have Osmanthus burkwoodii, which is also good if it's shady. Those two also have flowers, which are a bit insignificant on Eleagnus.
Escallonia might do if it's a sunny spot, and the bed is free draining. 

Just bear in mind that it'll take a while for anything to get to the sort of height you're after though 

Edlonton

Thank you both for the ideas.