I agree …. ash …. they’re expensive to remove when they’re large and they suck all the moisture out of the soil. The roots are shallow too so you can’t grow much around them. A wonderful tree for the countryside, but not for most gardens.
There’s probably a large female ash nearby … the seeds spread everywhere … the seedlings appear in the spring. Learn to recognise them. 😬 😉
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I would have a good look round for any other small ones, that you should be able to pull up easily by hand. We have a few ash trees in the area, and I must pull up hundreds every year. If they get bigger, or grow in a crack in concrete, for example, they are very hard to remove.
Carmarthenshire (mild, wet, windy). Loam over shale, very slightly sloping, so free draining. Mildly acidic or neutral.
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I live in west central Scotland - not where that photo is...
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.