I just got this a couple days ago. When I got these, the stalks/stems were deep green. After the first day here, they started getting that brown tinge to them, almost like they are sun burned or tanned. They were in partial sun at their former location, and I put them into full sun here at home. Is this normal? Any idea's or suggestions? One pic is the browning , the other is the normal colors..I just got it 05/15..