This is my neighbour's, and is higher than my garage roof. It has spiteful thorns and has started to self seed since the heatwave. Grateful for a name. Thanks.
Silver Surfer, clever you. I think you are spot on. I have never noticed any flowers on it, though it may be the culprit for the powder-paint yellow pollen everywhere. I presume they grow quickly, because I have to hack it back every year, and I'm sure that this shoot wasn't here a few months - or even weeks - ago. There was also a shoot in my dried-out lawn. Thank you again for your help - you know your stuff!
Your neighbour has the main tree. What you have popping up in your garden are probably suckers...growing from the roots of the main tree. Left to grow you too will have a large tree in no time.
Nooo! I have to climb the garage roof every year to hack it away as it is! Strange that in 20 years it has never rooted on my side before this drought. The soil is clay, but dry at the best of times as we are surrounded in atlas cedar, oak, sycamores, beech trees etc, so I was amazed it had sprouted so quickly in the lawn too. I'd have never have found that ID, so once again, thank you so much.
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Does it have white flowers?
Check/compare to Robinia pseudoacacia.
https://www.google.com/search?client=firefox-b&biw=1920&bih=943&tbm=isch&sa=1&ei=vqtRW8CiMcLUwAKkm46ACw&q=robinia+pseudoacacia&oq=+robinia+pseudoacacia&gs_l=img.1.0.0j0i67k1l2j0j0i67k1j0l5.2880.6342.0.8263.9.9.0.0.0.0.97.784.9.9.0....0...1c.1.64.img..0.9.780...0i7i30k1.0.aAmCouI4gc8
https://en.wikipedia.org/wiki/Robinia_pseudoacacia
Thank you again for your help - you know your stuff!
What you have popping up in your garden are probably suckers...growing from the roots of the main tree.
Left to grow you too will have a large tree in no time.
I'd have never have found that ID, so once again, thank you so much.