Table 4.

Survival and shoot-growth index of three shrub species grown in amended soil along an urban highway roadside for three years. Survival, at the end of each growing season, and shoot growth, in years two and three, are averaged over all soil amendment treatments.

Species	Year	Survival (%)	Shoot-growth index^{^z} (cm)
Fragrant sumac	2007	99 a^{^y}	--
	2008	79 b	67 b
	2009	78 b	78 a
Coralberry	2007	89 a	--
	2008	84 a	109 b
	2009	79 a	139 a
Oregon grape	2007	99 a	--
	2008	99 a	26 b
	2009	97 a	32 a

↵^z Shoot-Growth Index = [(widest width + narrowest width)/2 + height]/2.
↵^y Means within a species followed by different letters are significantly different (P < 0.05) by Tukey-Kramer adjusted LSD; n = 135 for fragrant sumac, 120 for coralberry, and 105 for Oregon grape.