Maple tree seeds that started growing in my garden
How do I get rid of it, since my neighbour cut his maple tree down I've been getting off shoots in my flower bed too close to my house
It sounds like buried roots are making an attempt to regrow. This is common, in my experience. Repeated cutting of shoots is one option. Another is to cut the shoot then immediately put concentrated herbicide on the cut. You will likely have to repeat this. Note that I recommend concentrate, not ready to spray herbicide. 15-20% glyphosate is concentrated RoundUp.