Grade Standards

Our Grade Standards follow the American Standard for Nursery Stock (ANSI Z60.1-2014) published by American Horticulture Industry Association d/b/a AmericanHort.

AMERICAN STANDARD FOR NURSERY STOCK
ANSI Z60.1–2014

Approved April 14, 2014
Copyright 2014 by amhort_logo_H_rgb. All rights reserved.

ANSI_Nursery_Stock_Standards_AmericanHort_2014

Surface Nursery Additional Grade Standard Definitions

Bare Root: All shade and flowering tree liners shall be healthy and free of pests with well branched, healthy roots capable of sustaining vigorous growth and characteristic of the species. Stem caliper measurements shall be taken at six inches above the soil surface in trees grown on their own root and above the bud union in budded trees.

Whips are immature shade trees that are used either in field plantings or grown to a larger size in containers. Whip refers to the fact that there is little or no lateral branching on the main trunk. Whips are normally 2 years old when grown from cuttings or seedlings and in the case of budded varieties they normally have a 1 year top and a 2 year root system. Whips shall have straight, sturdy trunks and a well-developed root system. Caliper measurements of whips may vary according to species. Lateral branches in the lower 40% of the total tree height shall be removed while any branches in the upper stem shall be left on to increase tree caliper.

Topworked (high graft or ground bud) and Weeping Trees are compact, dwarf or weeping varieties, grown with a straight main trunk (standards), such as crabapples and cherries. The graft height or heading height shall be specified along with grade size which shall be based on both head size and stem caliper.

  • #1 Light grades shall have fewer and/or shorter branches and/or less stem caliper than the #1 grade.
  • Heavy grades shall have longer branches and/or more stem caliper than the #1 grade.

Surface Select 1Yr Br are small, neatly branched trees normally 2 years old when grown from cuttings or seedlings and in the case of budded varieties they normally have a 1 year top and a 2 year root system. Specifically produced to fit smaller (13”w x 11”ht) container tree pots, grown with straight, sturdy trunks, a well developed root system, 6 or more branches, and typically average 5 -7’ in height.

Specimen Liners are large, light branched trees which are 4 years old, grown from seedlings and having a 2 year top and a 4 year undercut root system. Specifically produced for the caliper tree grower who desires branch free trunks to 6’, grown high topped at 7’ with straight, sturdy trunks and a well developed root system. The grade size shall be based on stem caliper.