This plant is about 3 feet tall. I have no idea if it is a weed or not, but I like it and am keeping it. Does anyone know what it is?

Looks like Aesculus sp.

possibly Chinese Chestnut. Are there any Chestnut trees nearby?

It does look like Aesculus (horsechestnut or buckeye). Chinese chestnut is a Castanea and has simple rather than compound leaves.

Then I guess I should have said Chinese Horse Chestnut (Aesculus chinensis). I forgot the horse.

islander said:Then I guess I should have said Chinese Horse Chestnut (Aesculus chinensis). I forgot the horse.

It's not a common tree in North America according to Missouri Botanical Garden (although we don't know where the ID plant is located either), but why A. chinensis as opposed to the more common Aesculus? Mobot has some pics of Chinese horse chestnut here:

http://www.missouribotanicalga...

It is a very common weed tree here. Maybe it's something else but it looks like a Chinese Horse Chestnut to me.

Thank you all for your help! It does appear to be an aesculus. I live in Oregon, USA. We moved into the house a few months ago and are trying to figure out what we have growing here. I'm going to need to transplant it as it is growing in between fences about 5 feet apart and will soon outgrow its space. Any tips on transplanting it? I'm new to gardening and want to learn as much as possible.

I haven't noticed any other plants/bushes/trees with similar leaves in the area. It is possible the last owners planted it.

islander said:It is a very common weed tree here. Maybe it's something else but it looks like a Chinese Horse Chestnut to me.

Wouldn't that more likely be Aesculus hippocastanum?

tobina said:I'm going to need to transplant it as it is growing in between fences about 5 feet apart and will soon outgrow its space. Any tips on transplanting it? I'm new to gardening and want to learn as much as possible.

If you can avoid it, I would not move it now. I would move it in the spring before it expands its new leaves.

California Buckeye (Aesculus californica) is native to Southwest Oregon. But that looks more like the leaves of an American Buckeye (Aesculus glabra).

To my eye the leaves of Aesculus glabra are slimmer...not so fat.

http://treeplantflowerid.com/d...

Aesculus californica leaves don't look a good match either.

http://www.missouribotanicalga...

Aesculus hippocastanum leaves have the right fat, crinkled, rugged leaves.

http://www.tree-guide.com/imag...

But to be positive it would help to see the flowers!