Can anyone ,with Hungarian names, tell me which is the fastest growing trees for privacy or hedges. I am not a gardner and have little knowledge of plants etc.

Leylandii, in any language they are fast!
Mine were approx 2 metres when i moved in, same as the next door neighbours, after 4 years we have both lopped 3 metres off the tops to bring them back down to something reasonable.
They do tend to sway about a lot in windy weather if they are too tall, a risk to the low internet, phone, tv cables in an urban environment.

what height is reasonable? In UK lucky me am not on the side neighbours have 20 foot high leylandi. I have no idea if the neighbours on the other side are happy about it. Our garden is south-east facing so those neighbours will find their lounge quite dark until probably 10am.

Only problem with Leylandii (Leyland Cyprus) is they do NOT have deep roots. What does that mean? In high wind areas they will lay over after a high wind event. I had 48 of them at another property and after a sustained 60 mph wind they all laid over and after that storm I had to cut them all down because they were then at a 45 degree angle and could not be straightened up. They were about 16-18 feet tall. Better off to obtain a different species.

As said above Leylandii however plant with caution they take a lot of water out of the ground and can grow 3ft+ in a year so as a hedge they can be a lot of work to keep under control. The faster the hedge plant grows the more maintenance it will require.

There are other useful hedging trees/bushes, do a google search in English to find the type with the features you like and then use the latin name to get Hungarian suppliers or go to a garden centre with a printout name and picture and ask.

Unfortunately there is no hedge bush that leaps out of the ground to 6ft high in 2-3 years and then stops growing - If anyone knows of such a bush - I would like some!

With hedges I have found you need to think about how wide do you want the hedge to grow. Plant it right on the border you'll be forever cutting it back from invading your neighbours property.

And plant the wrong one inside the border and you can loose a lot of garden

Thanks all

Cupressocyparis leylandii

In our experience the fastest growing hedge tree (the light green variation)

What Peter said about Leylandii. The Hungarian climate isn't really ideal for them.

Thujas are popular, and for good reason. The common varieties grow fairly fast up to about 4 to 5 m, then more or less stop.

Be careful with Thujas!
It seems that many of them now are infected - and they get brown all over You see them everywhere, not nice to view.
Don't know however what it is that kills them, maybe someone can help?

Ecetfa & Akacfa are very fast growing (trees, not hedges really) and once you have one, you'll get loads self-seeding in the area.

Akac fa (Robinia pseudoacacia) is a tree and won't be any use as a hedge row plant. It is very good as fire wood and as fence posts (I have some 25 years old and still good without any treatment) but IMO totally unsuited to a domestic garden (fairly fast growing, invasive and thorny.)