You have the variegated variety. It grows the same as regular arundo donax, but when young, it has a beautiful variegation to it, but loses it when the culms mature, and it begins to look like the regular arundo.

The young shoots probably have a tinge of pink on them also.

You have the best of the two varieties, in my opinion.

Kt

Yes, the variegated looses it's color through the season so even though it looked like all green when you harvested it, you got the versicolor. The white is strongest when youngest. I am not sure if it is supposed to be less hardy than non-variegated but it does just fine here in SE Kansas. I guess most of the variegated in my town is somewhat protected and grown as a specimine stand but it doesn't seem to have any more problem than the plain green.

Hopefully it won't last through your winter.

Just Kidding,

Well not really.