I think what gata montes is the genus of plants, robina. There are a bunch of bushes and trees in that genus.. I think what you have is a black locust. It is a gorgeous tree. I would rather have a black locust any day over a rose bush.
I am afraid you will have to move to the Texas Hill Country to get a grape koolaid smelling plant. Gboogle robina genus photos which includes black locust. I'll just bet that what you have is one of those flowering trees albeit forsaken and not taken care of.
here is what it looks like when in flower.
and yes Robinias are very fragrant too - but with a slightly more floral hue to the scent
Mountian Laurels here are found in nature as undergrowth shrubs. They are a multi-trunk shrub but many people prune them to be single trunk trees and as far as I know only grow in alkaline soils. Still the resembalance is striking. A Mountian Laurel produces seed pods that have a rounded seed about the size of a bean and they are red. When I was a kid we would rub the seed on our jeans real fast and then touch the seed onto some poor unsuspecting person and give them a little burn. The seeds are very hard and need scarrifing to germinate well. The biggest tree I have seen was 18-20 ft tall.I would agree - I too think it would be a really good idea to wait until it has grown a bit more and flowers - especially as at this stage its really difficult to tell exactly what you have growing - as both the Mountain Laurel and the Robinia are very similar - although looking at your pictures - I'm more than positive that it is one of the many varieties of Robinia - but either way both are equally attractive and look very striking in the garden
Robinia can be grown as a small shrub or a large tree depending on the variety and how much you prune it and can look very similar to this when grown as a tree
View attachment 2629
The blossoms of a Robinia are different from the Mountain Laurel in that they are more pea like and come in every shade of pink and lilac as well as white and although the blossoms have an intense fragrance too - they have a more floral scent than the Mountain Laurel and for identification purposes here are some Robinia blossoms
View attachment 2631
The Mountain Laurel although very similar to the Robinia is slightly more woody and tends to look very similar to Wisteria - with flowers that are generally blue/lilac and look like this
View attachment 2632
and although I think that Mountain Laurel can also be grown as a shrub as well as a tree - but think Chuck would be able to confirm on that one
View attachment 2634
Hopefully this will help a little more
Don't forget to feed it and give it a drink every couple of weeks or so. Go organic. It is much more forgiving
From what you have just described the robina is even more similar to my mountian laurel. If it gets even the slightest bit too wet it will go into a decline and will be covered up with caterpillars in just a few days I have grown this thing from a seed and over the 8 or 9 years I haven't given it any fertilizer at all and I never water it. I find it strange that two plants from two different genus can be so much alike in appearence and growth habits What makes one robina and the other calia?That is exactly what I would do - so am really pleased that you've decided to keep it - especially as they are such a really attractive tree/shrub from quite an early stage and actually very easy to care for- as they are extremely hardy and tolerant of most things including drought - although I think - as they can be invasive - it might be an idea to keep an eye out for suckers and remove them as they arrive - otherwise you may land up with a rapidly spreading forest
However there are a few things that I feel are worth mentioning - so that you have Robinia that flourishes and looks its best - the first one being that as they are drought tolerant they actually don't like being watered too often and secondly - even though yours is currently looking a bit straggly - don't be tempted to prune it just yet - as they are best hard pruned in late summer or early autumn - at which time if you wanted to propagate your tree - as cuttings root easily - you could use the pruned cuttings to multiply your collection
As for fertilizer - even though we all feel that by fertilizing plants - we are looking after them and giving them what they need - this is not the case with Robinias as they are better if they are not fertilized - as they don't respond very favorably to fertilizer and actually prefer to grow in very poor soil - otherwise they tend to become brittle, straggly and weak - which makes them more prone to disease.
As Chuck has mentioned that organic feed is best and I would agree - one of the best organic methods of feeding roses is to use banana peels - which is the way I feed mine and is best done with either a mulch of dried banana peels or as a liquid fertilizer - rather than using the fresh peels.
I thought that you might find this thread helpful
https://www.gardening-forums.com/threads/save-your-banana-peels-for-your-plants.837/
as it contains some very useful information as well as instructions on how to dry them