Used to grow Albizia julibrissin in my garden (E.England) ; very sporadic growth and not particularly successful here ; needs longer and hotter summers than the UK can normally provide .
Stll available through garden centres around here .
I have an albizia here in the Vendée and it's doing well but, after this cold spring, took a long ti eto come into leaf. Same for our neighbours.
Lots of Indian lilacs around here too and a lovely rich red flower show. It's another that won't like deep frosts so I would be wary of trying it if you get below -5C for any length of time.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
I have grown a few silk trees from seed @Grajean , and although none of them have flowered yet I am hopeful that they will in the next year or two. There is one in a car park nearby that flowers every year and mine are miniature versions of this tree. Picture here shows the mature tree with flowers that is growing in a local car park.This shows one of my trees in 2017, they are now roughly 5 foot tall (planted in border) and perhaps one day will outgrow their position. If you can keep the seed in a cold GH for the first year whilst it germinates and established and then plant outside once it is a few inches tall I don't see why you shouldn't be able grow them successfully - allow for some failures, keep in a sheltered place until established, be prepared to re-pot a few times before it is ready to be planted in it's final position. Good luck and let us know how well they developed in time.
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Never seen/heard of them growing in UK.
They are super large trees from hot countries.
1. Albizia julibrissin...silk tree.
http://architecturalplants.com/plants/id/albizia-julibrissin-rosea
https://www.google.com/search?q=Albizia+julibrissin&client=firefox-b-d&channel=crow&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjftJWOobLkAhXgThUIHX2UBp8Q_AUIESgB&biw=1920&bih=944
2. Azadirachta indica...Indian lilac/Neem tree.
https://en.wikipedia.org/wiki/Azadirachta_indica
https://www.google.com/search?client=firefox-b-d&channel=crow&biw=1920&bih=944&tbm=isch&sa=1&ei=axttXZbyIJXFxgPdprKoAg&q=azadirachta+indica+flowers&oq=Azadirachta+indica+flowers&gs_l=img.1.0.0j0i24.3688.5671..7553...0.0..0.103.709.6j2......0....1..gws-wiz-img.......0i67.Q_N5ktHndIk
Lots of Indian lilacs around here too and a lovely rich red flower show. It's another that won't like deep frosts so I would be wary of trying it if you get below -5C for any length of time.