I have asked 'Google' in every way possible to find an answer to the following question...(I never get an answer). So I have two older, large, all green leaves poinsettias. My question is...can I transplant both of them into one large pot? I'd be grateful for your reply. Thank you.
Sure you can!
Make sure you choose a pot that have enough room for both root balls and just a bit more room around the sides and bottom. Don't use too large of a pot, this can lead to overwatering and root rot.
The plants should sit as the same level in the new pot.
A container should have a good drainage hole and use a good commercial potting soil.