Green stalked rhubarb
by Marcia
(Abbotsford, BC Canada)
Doug says there are green-stalked varieties of rhubarb indeed and these are often found in home gardens. The red stalked ones 'Valentine' etc tend to be redder. So yes, green stalks are quite common and indeed normal.
As for not being big on fertilizing - the real trick with rhubarb is to mulch it and toss compost on it every year and stand back. They'll become huge with this treatment.